How to get a variable name as a string in PHP? Last Updated : 17 Jul, 2024 Summarize Suggest changes Share Like Article Like Report Use variable name as a string to get the variable name. There are many ways to solve this problem some of them are discussed below: Table of ContentUsing $GLOBALSUsing $$ OperatorUsing debug_backtrace()Using get_defined_vars() and array_search()Method 1: Using $GLOBALS: It is used to reference all variables available in the global scope. It is an associative array containing the reference of all variables currently defined in the global scope. Example: This example uses $GLOBAL reference to get the variable name as a string. php <?php // Declare and initialize a variable $test = "This is a string"; // Function that returns the variable name function getVariavleName($var) { foreach($GLOBALS as $varName => $value) { if ($value === $var) { return $varName; } } return; } // Function call and display the // variable name print getVariavleName($test); ?> Outputtest Method 2: Using $$ Operator The $$var_name is known as reference variable where $var_name is a normal variable. The $$var_name used to refer to the variable with the name as value of the variable $var_name. Example:This example uses $$ operator to get the variable name as a string. php <?php // Declare and initialize a variable $name = "test"; // Reference variable to store string $$name = "This is a string"; // Display result print($name); ?> Outputtest Using debug_backtrace()Using debug_backtrace() in PHP, you can extract a variable name from the debug information. This involves reading the specific line of code where the function was called.Example PHP <?php function getVariableName() { $trace = debug_backtrace(); $line = file($trace[0]["file"])[$trace[0]["line"] - 1]; preg_match('/\\$(\w+)/', $line, $matches); return $matches[1]; } $myVar = "Hello, World!"; $varName = getVariableName(); echo $varName . PHP_EOL; // Output: myVar ?> OutputvarName Using get_defined_vars() and array_search()The get_defined_vars() function returns an array of all defined variables, both local and global. By searching this array, we can find the key (variable name) corresponding to a given value.Example: PHP <?php // Function to get the variable name as a string function getVariableName(&$var) { // Get all defined variables in the current scope $definedVars = get_defined_vars(); // Search for the variable in the defined variables array $variableName = array_search($var, $definedVars, true); // Return the variable name if found, otherwise return null return $variableName !== false ? $variableName : null; } // Example variables $exampleVar = "test value"; $anotherVar = 42; // Get the variable names $exampleVarName = getVariableName($exampleVar); $anotherVarName = getVariableName($anotherVar); echo "The variable name of exampleVar is: " . $exampleVarName . "\n"; echo "The variable name of anotherVar is: " . $anotherVarName . "\n"; ?> OutputThe variable name of exampleVar is: var The variable name of anotherVar is: var Advertise with us Next Article Removing occurrences of a specific character from end of a string in PHP N Nilarjun Follow Similar Reads PHP Programs PHP Programs is a collection of coding examples and practical exercises designed to help beginners and experienced developers. This collection covers a wide range of questions based on Array, Stirng, Date, Files, ..., etc. Each programming example includes multiple approaches to solve the problem.Wh 7 min read PHP Basic ProgramsDifferent ways to write a PHP codeThe full form of PHP is a Hypertext preprocessor. It was developed by Rasmus Lerdorf. It is a programming language for developing dynamic web applications and interactive websites. It is a server-side scripting language. It is used for establishing a connection between the front-end and database i.e 2 min read How to write comments in PHP ?Comments are non-executable lines of text in the code that are ignored by the PHP interpreter. Comments are an essential part of any programming language. It help developers to understand the code, provide explanations, and make the codebase more maintainable. Types of Comments in PHPPHP supports tw 1 min read Introduction to Codeignitor (PHP)Codeignitor is one of the popular MVC framework of PHP. Most of the developers prefer to make their projects on Codeignitor because of it's lightweight and easy to understand documentation. Some of the features, advantages or why use Codeignitor is given below. Why use Codeignitor? Fast and lightwei 4 min read How to echo HTML in PHP ?While making a web application with PHP, we often need to print or echo few results in form of HTML. We can do this task in many different ways. Some of methods are described here: Using echo or print: PHP echo or print can be used to display HTML markup, javascript, text or variables. Example 1: Th 2 min read Error handling in PHPPrerequisite: Types of Error PHP is used for web development. Error handling in PHP is almost similar to error handling in all programming languages. The default error handling in PHP will give file name line number and error type. Ways to handle PHP Errors: Using die() methodCustom Error Handling B 3 min read How to show All Errors in PHP ?We can show all errors in PHP using the error_reporting() function. It sets the error_reporting directive at runtime according to the level provided. If no level is provided, it will return the current error reporting level. error_reporting(E_ALL) level represents all errors, warnings, notices, etc. 3 min read How to Start and Stop a Timer in PHP ?You can start and stop a timer in PHP using the microtime() function in PHP. The microtime() function is an inbuilt function in PHP which is used to return the current Unix timestamp with microseconds. In this article, you will learn the uses of the microtime() function. Syntax: microtime( $get_as_f 2 min read How to create default function parameter in PHP?The default parameter concept comes from C++ style default argument values, same as in PHP you can provide default parameters so that when a parameter is not passed to the function. Then it is still available within the function with a pre-defined value. This function also can be called optional par 1 min read How to check if mod_rewrite is enabled in PHP ?In PHP, there is an inbuilt function called ‘phpinfo’. By using this function, we can output all the Loaded Modules and see the ‘mod_rewrite’ is enabled or not. Syntax: phpinfo(); Here is a process to check the ‘mod_rewrite’ load module is enabled or not. Note: The local server used here is XAMPP. C 1 min read Web Scraping in PHP Using Simple HTML DOM ParserWeb Scraping is a technique used to extract large amounts of data from websites extracted and saved them to a local file in your computer or to a database or can be used as API. Data displayed by most websites can be viewed by using a web browser only. They do not offer the functionality to save a c 2 min read How to pass form variables from one page to other page in PHP ?Form is an HTML element used to collect information from the user in a sequential and organized manner. This information can be sent to the back-end services if required by them, or it can also be stored in a database using DBMS like MySQL. Splitting a form into multiple steps or pages allow better 4 min read How to display logged in user information in PHP ?In social networking websites like Facebook, Instagram, etc, the username and profile picture of the user that has logged in gets displayed in the header of the website, and that header remains constant, irrespective of the webpage the user has opened. Such functionality can be created by using the 11 min read How to find out where a function is defined using PHP ?When we do projects then it includes multiple modules where each module divided into multiple files and each file containing many lines of code. So when we declare a function somewhere in the files and forget that what the function was doing or want to change the code of that function but can't find 3 min read How to Get $_POST from multiple check-boxes ?$_POST is an array of variable names. The program given below illustrates how to write HTML structure for multiple valued checkbox and to get the values of multiple valued checkbox using $_POST in PHP. Note: The name attribute of checkboxes must be the same name and must be initialized with an array 2 min read How to Secure hash and salt for PHP passwords ?Salting and hashing is a technique to store the password in a database. In cryptography, salting means to add some content along with the password and then hashing it. So salt and hash provide two levels of security. Salting always makes unique passwords i.e if there are two same passwords, after sa 2 min read How to detect search engine bots with PHP ?Search engine bots (sometimes called spiders or crawlers) are computer programs(bots) that crawl the web pages. In other words, they visit webpages, find links to further pages, and visit them. Often they map content that they find to use later for search purposes (indexing). They also help develope 2 min read How to set PHP development environment in windows ?What is PHP ? PHP (Hypertext PreProcessor) is a general-purpose programming language developed by Rasmus Lerdorf in 1994 for web development. This is one of the most popular programming language for beginners in web development because of its simplicity, large community and accessibility.Steps to se 3 min read How to turn off PHP Notices ?In PHP, Notices are the undefined variables indicated in the PHP project on a set of lines or particular lines. It usually does not affect or break the functionality of the code written. When PHP notices detect errors, it will display like this: PHP Notice: Use of undefined constant name - assumed ' 2 min read What does '<?=' short open tag mean in PHP ?The <php is used to identify the start of a PHP document. In PHP whenever it reads a PHP document, It looks for: php <?php ?> It process the codes in between the above tags only and leaves the other codes around them. For example : php <?php echo "Hello PHP !"; ?> Output: He 2 min read PHP Array ProgramsProgram to Insert new item in array on any position in PHPNew item in an array can be inserted with the help of array_splice() function of PHP. This function removes a portion of an array and replaces it with something else. If offset and length are such that nothing is removed, then the elements from the replacement array are inserted in the place specifi 4 min read PHP append one array to anotherGiven two array arr1 and arr2 and the task is to append one array to another array. Examples: Input : arr1 = [ 1, 2 ] arr2 = [ 3, 4 ] Output : arr1 = [ 1, 2, 3, 4 ] Input : arr1 = [ "Geeks", "g4g" ] arr2 = [ "GeeksforGeeks" ] Output : arr1 = [ "Geeks", "g4g", "GeeksforGeeks" ] Using array_merge func 2 min read How to delete an Element From an Array in PHP ?To delete an element from an array means to remove a specific value or item from the array, shifting subsequent elements to the left to fill the gap. This operation adjusts the array's length accordingly, eliminating the specified element.This article discusses some of the most common methods used i 4 min read How to print all the values of an array in PHP ?We have given an array containing some array elements and the task is to print all the values of an array arr in PHP. In order to do this task, we have the following approaches in PHP:Table of ContentUsing for-each loop: Using count() function and for loop: Using implode():Using print_r() FunctionUs 3 min read How to perform Array Delete by Value Not Key in PHP ?An array is essentially a storage element for key-value pairs belonging to the same data type. If keys are specified explicitly, ids beginning from 0 as assigned to the values by the compiler on their own. Arrays allow a large variety of operations, like access, modification, and deletion upon the s 6 min read Removing Array Element and Re-Indexing in PHPIn order to remove an element from an array, we can use unset() function which removes the element from an array, and then use array_values() function which indexes the array numerically automatically. Function Usedunset(): This function unsets a given variable. Syntax:void unset ( mixed $var [, mix 2 min read How to count all array elements in PHP ?We have given an array containing some array elements and the task is to count all elements of an array arr using PHP. In order to do this task, we have the following methods in PHP:Table of ContentUsing count() MethodUsing sizeof() MethodUsing a loopUsing iterator_count with ArrayIteratorUsing arra 4 min read How to insert an item at the beginning of an array in PHP ?Arrays in PHP are a type of data structure that allows us to store multiple elements of similar data type under a single variable thereby saving us the effort of creating a different variable for every data. The arrays are helpful to create a list of elements of similar types, which can be accessed 5 min read PHP Check if two arrays contain same elementsIn this article, we will see how to compare the elements of arrays in PHP, & will know how to apply to get the result after comparison through the examples. In PHP, there are two types of arrays, Indexed array and Associative array. In an Indexed array, the array elements are index numerically s 4 min read Merge two arrays keeping original keys in PHPMerging two arrays in PHP while preserving the original keys can be done using the array_merge or array_replace functions, depending on the desired behavior.Below are the methods to merge two arrays while keeping the original keys in PHP:Table of ContentUsing + operatorUsing inbuilt array_replace() 4 min read PHP program to find the maximum and the minimum in arrayFinding the maximum and minimum in an array involves determining the largest and smallest values within a given set of numbers. This task is crucial for analyzing data, identifying trends, or filtering outliers. 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Examples: Input : array(3, 3, 4, 5, 5, 5, 9, 8, 8, 8, 8, 8); Output : Second most frequent element is: 5 Input : array("geeks", "for", "geeks"); Output : Second most frequent element is: for Here are some common approache 4 min read Sort array of objects by object fields in PHPSorting an array of objects by object fields means organizing the array's objects based on the values of specified properties (fields) within each object, typically in ascending or descending order, to arrange the data meaningfully.Here we have some common approaches:Table of ContentUsing usort()Usi 4 min read PHP Sort array of strings in natural and standard ordersYou are given an array of strings. You have to sort the given array in standard way (case of alphabets matters) as well as natural way (alphabet case does not matter).Input : arr[] = {"Geeks", "for", "geeks"}Output : Standard sorting: Geeks for geeks Natural sorting: for Geeks geeks Input : arr[] = 2 min read PHP | Print the last value of an array without affecting the pointerWe are given an array with key-value pair, and we need to find the last value of array without affecting the array pointer. Examples: Input : $arr = array('c1' => 'Red', 'c2' => 'Green', 'c3' => 'Blue', 'c4' => 'Black') Output : Black Input : $arr = array('p1' => 'New York', 'p2' = 2 min read How to merge the first index of an array with the first index of second array?The task is to merge the first index of an array with the first index of another array. Suppose, an array is array1 = {a, b, c} and another array is array2 = {c, d, e} if we perform the task on these arrays then the output will be result array { [0]=> array(2) { [0]=> string(1) "a" [1]=> st 3 min read How to create a string by joining the array elements using PHP ?We have given an array containing some array elements and the task is to join all the array elements to make a string. In order to do this task, we have the following methods in PHP:Table of ContentUsing implode() Method: Using join() MethodUsing array_reduce()Using a Foreach LoopUsing array_map() w 3 min read How to sort an Array of Associative Arrays by Value of a Given Key in PHP ?Each entry in the associative array is characterized by a unique key-value pair. An array can contain singular data types belonging to variables or other arrays as its elements. There are multiple ways to sort an array of associative arrays by the value of a specified key. Table of ContentUsing the 6 min read How to make a leaderboard using PHP ?The purpose of this article is to make a simple program to create a leaderboard using PHP. Below is the implementation for the same using PHP.  The prerequisites of this topic are PHP/MySQL and the installment of Apache Server on your computer. Approach: Step 1: First we will create a HTML table usi 2 min read How to check an array is multidimensional or not in PHP ?Given an array (single-dimensional or multi-dimensional) the task is to check whether the given array is multi-dimensional or not. Below are the methods to check if an array is multidimensional or not in PHP:Table of ContentUsing rsort() functionUsing Nested foreach LoopUsing a Recursive FunctionUsi 4 min read Multidimensional Associative Array in PHPPHP Multidimensional array is used to store an array in contrast to constant values. Associative array stores the data in the form of key and value pairs where the key can be an integer or string. Multidimensional associative array is often used to store data in group relation. Creation: We can crea 4 min read How to merge the duplicate value in multidimensional array in PHP?To merge the duplicate value in a multidimensional array in PHP, first, create an empty array that will contain the final result. Then we iterate through each element in the array and check for its duplicity by comparing it with other elements. If duplicity is found then first merge the duplicate el 4 min read Convert multidimensional array to XML file in PHPGiven a multi-dimensional array and the task is to convert this array into an XML file. To converting the multi-dimensional array into an xml file, create an XML file and use appendChild() and createElement() function to add array element into XML file. Example: First, create a PHP Multidimensional 2 min read How to search by multiple key => value in PHP array ?In a multidimensional array, if there is no unique pair of key => value (more than one pair of key => value) exists then in that case if we search the element by a single key => value pair then it can return more than one item. Therefore we can implement the search with more than one key = 5 min read How to search by key=>value in a multidimensional array in PHP ?In PHP, multidimensional array search refers to searching a key=>value in a multilevel nested array. This search can be done either by the iterative or recursive approach. Table of ContentRecursive ApproachIterative ApproachUsing array_filter() FunctionRecursive Approach:Check if the key exists i 4 min read PHP program to find the Standard Deviation of an arrayGiven an array of elements. We need to find the Standard Deviation of the elements of the array in PHP. Examples: Input : array(2, 3, 5, 6, 7)Output : 1.5620499351813Input : array(1, 2, 3, 4, 5)Output : 1 The following problem can be solved using the PHP inbuilt functions. The inbuilt functions used 2 min read PHP program to check for AnagramAn anagram is a word or phrase formed by rearranging the letters of another word or phrase, using all the original letters exactly once. To check for anagrams in PHP, remove spaces, convert to lowercase, sort characters, and compare the sorted strings or arrays.ExamplesInput : "anagram", "nagaram"Ou 5 min read PHP Function ProgramsHow to pass PHP Variables by reference ?By default, PHP variables are passed by value as the function arguments in PHP. When variables in PHP is passed by value, the scope of the variable defined at function level bound within the scope of function. Changing either of the variables doesn't have any effect on either of the variables. Examp 2 min read How to format Phone Numbers in PHP ?In this article, we will learn how to format phone numbers using PHP. When we need to store a phone number then we store the formatting phone number. Using PHP, we can easily format phone numbers. Approach: In this article, we will format the phone number using the preg_match() method. We can use th 1 min read How to use serialize() and unserialize() Function in PHP?In PHP, complex data can not be transported or can not be stored. If you want to execute continuously a complex set of data beyond a single script then these serialize() and unserialize() functions are handy to deal with those complex data structures. The serialize() function just gives a compatible 2 min read PHP Callback FunctionsIn PHP, the callback functions are related to the dynamic behavior and flexibility in code execution. 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If arrays have duplicate string keys, the latter values overwrite earlier ones, while numerical keys are re-indexed sequentially.Syntaxarray array_merge($array1, 2 min read PHP program to print an arithmetic progression series using inbuilt functionsWe have to print an arithmetic progressive series in PHP, between two given numbers a and b both including, a given common arithmetic difference of d. Examples: Input : $a = 200, $b = 250, $d = 10 Output : 200, 210, 220, 230, 240, 250 Input : $a = 10, $b = 100, $d = 20 Output : 10, 30, 50, 70, 90Th 2 min read How to prevent SQL Injection in PHP ?In this article, we are going to discuss how to prevent SQL injection in PHP. The prerequisite of this topic is that you are having XAMPP in your computer. Why SQL injection occurs? SQL injection is a code injection technique used to attack data-driven applications, in which malicious SQL statements 3 min read How to extract the user name from the email ID using PHP ?Given a string email address, extract the username. Input: ‘priyank@geeks.com’ Output: priyank Input: ‘princepriyank@gfg.com’ Output: princepriyank Approach 1: Using PHP strstr() to extract the username from the email address. In this, “@†symbol is the separator for the domain name and user name of 2 min read How to count rows in MySQL table in PHP ?PHP stands for hypertext preprocessor. MySQL is a database query language used to manage databases. In this article, we are going to discuss how to get the count of rows in a particular table present in the database using PHP and MySQL. Requirements: XAMPP Approach: By using PHP and MySQL, one can p 3 min read How to parse a CSV File in PHP ?In this article, we learn to parse a CSV file using PHP code, along with understanding its basic implementation through examples.  Approach: The following approach will be utilized to parse the CSV File using PHP, which is described below: Step 1. Add data to an Excel file. The following example is 3 min read How to generate simple random password from a given string using PHP ?In this article, we will see how to generate a random password using the given string. We have given a string and the task is to generate a random password from it. Example: Input: abgADKL123 Output: abgADKL123 Input: geeksforgeeks Output: egksegsfroeke To achieve this, we use the following approach 3 min read How to upload images in MySQL using PHP PDO ?In this article, we will upload images to the MySQL database using PHP PDO and display them on the webpage. Approach: Make sure you have a XAMPP server or WAMP server installed on your machine. In this tutorial, we will be using the WAMP server. Article content: Table StructureDatabase configuratio 5 min read How to check foreach Loop Key Value in PHP ?In PHP, the foreach loop can be used to loop over an array of elements. It can be used in many ways such asTable of ContentUsing the for-each loop with simple valuesUsing the foreach loop with Key-Value pairsUsing array_keys Function to Access Keys and ValuesUsing array_walk Function for IterationUs 3 min read How to properly Format a Number With Leading Zeros in PHP ?A number is essentially a sequence of digits stacked together to form an integer or string. A number can begin with leading zeros. A number can also be looped through and modifications can be made to append or concatenate another sequence of characters into it. Approach 1: Using a for loop for strin 4 min read How to get a File Extension in PHP ?In this article, we will learn how to get the current file extensions in PHP. Input : c:/xampp/htdocs/project/home Output : "" Input : c:/xampp/htdocs/project/index.php Output : ".php" Input : c:/xampp/htdocs/project/style.min.css Output : ".css" Using $_SERVER[‘SCRIPT_NAME’]: $_SERVER is an array o 2 min read Build a Grocery Store Web App using PHP with MySQLIn this article, we are going to build a Grocery Store Web Application using PHP with MySQL. In this application, we can add grocery items by their name, quantity, status (pending, bought, not available), and date. We can view, delete and update those items. There will be a date filtering feature wh 7 min read How to delete text from file using preg_replace() function in PHP ?Given a file containing some elements and the task is to delete the content of the file using preg_replace() function. The preg_replace() function is searches the string pattern in the file and if string pattern found then it replace with the required string. 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This process allows you to represent dates and times as strings in various formats, such as Y-m-d H:i:s. There are some following approachesTable of ContentB 4 min read How to get Time Difference in Minutes in PHP ?In this article, we will learn how to get time difference in minutes using PHP. We will be using the built-in function date_diff() to get the time difference in minutes. For this, we will be needed a start date and end date to calculate their time difference in minutes using the date_diff() function 3 min read Return all dates between two dates in an array in PHPReturning all dates between two dates in an array means generating a list of all consecutive dates from the start date to the end date, inclusive, and storing each date as an element in an array for easy access.Here we have some common methods:Table of ContentUsing DatePeriod ClassUsing strtotime() 4 min read Sort an array of dates in PHPWe are given an array of multiple dates in (Y-m-d) format. We have to write a program in PHP to sort all the dates in the array in decreasing order. Examples : Input : array("2018-06-04", "2014-06-08", "2018-06-05") Output : 2018-06-05 2018-06-04 2014-06-08 Input : array("2016-09-12", "2009-09-08", 2 min read Return all dates between two dates in an array in PHPReturning all dates between two dates in an array means generating a list of all consecutive dates from the start date to the end date, inclusive, and storing each date as an element in an array for easy access.Here we have some common methods:Table of ContentUsing DatePeriod ClassUsing strtotime() 4 min read How to convert a Date into Timestamp using PHP ?The Task is to convert a Date to a timestamp using PHP. The task can be done by using the strtotime() function in PHP. It is used to convert English textual date-time description to a UNIX timestamp. The UNIX timestamp represents the number of seconds between a particular date and the Unix Epoch. Sy 1 min read How to Add 24 Hours to a Unix Timestamp in PHP?The Unix Timestamp is designed to track time as a running total of seconds from the Unix Epoch on January 1st, 1970 at UTC. To add 24 hours to a Unix timestamp we can use any of these methods: Approach 1: Direct Addition of SecondsConvert 24 hours to seconds and add the result to the current Unix ti 2 min read Sort a multidimensional array by date element in PHPSorting a multidimensional array by element containing date. Use the usort() function to sort the array. The usort() function is PHP builtin function that sorts a given array using user-defined comparison function. This function assigns new integral keys starting from zero to array elements. Syntax: 2 min read Convert timestamp to readable date/time in PHPProblem: Convert timestamp to readable date/time in PHP Solution: This can be achieved with the help of date() function, which is an inbuilt function in PHP can be used to format the timestamp given by time() function. This function returns a string formatted according to the given format string usi 1 min read PHP | Number of week days between two datesYou are given two string (dd-mm-yyyy) representing two date, you have to find number of all weekdays present in between given dates.(both inclusive) Examples: Input : startDate = "01-01-2018" endDate = "01-03-2018" Output : Array ( [Monday] => 9 [Tuesday] => 9 [Wednesday] => 9 [Thursday] = 2 min read PHP | Converting string to Date and DateTimeConverting the string to Date and DateTime uses several functions/methods like strtotime(), getDate(). We will see what these functions do. strtotime() This is basically a function which returns the number of seconds passed since Jan 1, 1970, just like a linux machine timestamp. It returns the numbe 2 min read How to get last day of a month from date in PHP ?Given a date and the task is to print the last day of the month. We will use date() and strtotime() function to get the last day of the month. Used PHP functions:date() function: Format a local time/date.strtotime() function: Parse about any English textual datetime description into a Unix timestamp 2 min read PHP String ProgramsPHP Change strings in an array to uppercaseChanging strings in an array to uppercase means converting all the string elements within the array to their uppercase equivalents. This transformation modifies the array so that every string, regardless of its original case, becomes fully capitalized.Examples:Input : arr[] = ("geeks", "For", "GEEks 3 min read How to convert first character of all the words uppercase using PHP ?To convert the first character of all the words present in a string to uppercase, we just need to use one PHP function i.e. ucwords().ucwords(string,delimiters)This function takes 2 parameters. The first one is the string which is mandatory. The second parameter is the delimiter. Example 1:PHP<?p 2 min read How to get the last character of a string in PHP ?In this article, we will find the last character of a string in PHP. The last character can be found using the following methods.Using array() Method: In this method, we will find the length of the string, then print the value of (length-1). For example, if the string is "Akshit" Its length is 6, in 2 min read How to convert uppercase string to lowercase using PHP ?Converting an uppercase string to lowercase means changing all capital letters in the string to their corresponding small letters. This is typically done using programming functions or methods to ensure uniformity in text formatting and comparison.Below we have some common approaches Table of Conten 2 min read How to extract Numbers From a String in PHP ?Extracting numbers from a string involves identifying and isolating numerical values embedded within a text. This process can be done using programming techniques, such as regular expressions, to filter out and retrieve only the digits from the string, ignoring all other characters.Here we have some 3 min read How to replace String in PHP ?Replacing a string in PHP involves substituting parts of a string with another string. Common methods include str_replace() for simple replacements, preg_replace() for pattern-based replacements, substr_replace() for positional replacements, and str_ireplace() for case-insensitive replacements. Each 2 min read How to Encrypt and Decrypt a PHP String ?In PHP, Encryption and Decryption of a string is possible using one of the Cryptography Extensions called OpenSSL function for encrypt and decrypt. openssl_encrypt() Function: The openssl_encrypt() function is used to encrypt the data. Syntax: string openssl_encrypt( string $data, string $method, st 4 min read How to display string values within a table using PHP ?A table is an arrangement of data in rows and columns, or possibly in a more complex structure. Tables are widely used in communication, research, and data analysis. Tables are useful for various tasks such as presenting text information and numerical data.Tables can be used to compare two or more i 1 min read How to write Multi-Line Strings in PHP ?Multi-Line Strings can be written in PHP using the following ways.Using escape sequencesWe can use the \n escape sequences to declare multiple lines in a string.PHP Code:PHP<?php //declaring multiple lines using the new line escape sequence $var="Geeks\nFor\nGeeks"; echo $var; ?>Output:Geeks F 2 min read How to check if a String Contains a Substring in PHP ?Checking whether a string contains a specific substring is a common task in PHP. Whether you're parsing user input, filtering content, or building search functionality, substring checking plays a crucial role.MethodsBelow are the following methods by which we can check if a string contains a substri 1 min read How to append a string in PHP ?We have given two strings and the task is to append a string str1 with another string str2 in PHP. There is no specific function to append a string in PHP. In order to do this task, we have the this operator in PHP:Table of ContentUsing Concatenation assignment operator (".=")Using Concatenation Ope 3 min read How to remove white spaces only beginning/end of a string using PHP ?We have given a string and the task is to remove white space only from the beginning of a string or the end from a string str in PHP. In order to do this task, we have the following methods in PHP:Table of ContentUsing ltrim() MethodUsing rtrim() MethodUsing a Custom Regular Expression with preg_rep 3 min read How to Remove Special Character from String in PHP?We are given a string and the task is to remove special characters from string str in PHP.Below are the approaches to remove special characters from string in PHP:Table of ContentUsing str_replace() MethodUsing str_ireplace() MethodUsing preg_replace() MethodUsing str_replace() MethodThe str_replace 2 min read How to create a string by joining the array elements using PHP ?We have given an array containing some array elements and the task is to join all the array elements to make a string. In order to do this task, we have the following methods in PHP:Table of ContentUsing implode() Method: Using join() MethodUsing array_reduce()Using a Foreach LoopUsing array_map() w 3 min read How to prepend a string in PHP?We have given two strings and the task is to prepend a string str1 with another string str2 in PHP. There is no specific function to prepend a string in PHP. To do this task, we have the following operators in PHP:Below are the methods to prepend a string in PHPTable of ContentUsing Concatenation Op 2 min read How to replace a word inside a string in PHP ?Given a string containing some words the task is to replace all the occurrences of a word within the given string str in PHP. To do this task, we have the following methods in PHP:Table of ContentUsing str_replace() MethodUsing str_ireplace() Method Using preg_replace() MethodUsing strtr()Using preg 4 min read How to remove all white spaces from a string in PHP ?Given a string element containing some spaces and the task is to remove all the spaces from the given string str in PHP. In order to do this task, we have the following methods in PHP:Table of ContentUsing str_replace() MethodUsing str_ireplace() MethodUsing preg_replace() MethodUsing explode() and 4 min read How to count the number of words in a string in PHP ?Given a string containing some words and the task is to count number of words in a string str in PHP. In order to do this task, we have the following approaches:Table of ContentUsing str_word_count() MethodUsing trim(), preg_replace(), count() and explode() method. Using trim(), substr_count(), and 4 min read How to find number of characters in a string in PHP ?We have given a string and the task is to count number of characters in a string str in PHP. In order to do this task, we have the following methods in PHP:Table of ContentMethod 1: Using strlen() MethodMethod 2: Using mb_strlen() MethodMethod 3: Using iconv_strlen() MethodMethod 4: Using grapheme_s 3 min read How to get a substring between two strings in PHP?To get a substring between two strings there are few popular ways to do so. Below the procedures are explained with the example.Examples: Input:$string="hey, How are you?"If we need to extract the substring between "How" and "you" then the output should be are Output:"Are"Input:Hey, Welcome to Geeks 4 min read How to get a variable name as a string in PHP?Use variable name as a string to get the variable name. There are many ways to solve this problem some of them are discussed below: Table of ContentUsing $GLOBALSUsing $$ OperatorUsing debug_backtrace()Using get_defined_vars() and array_search()Method 1: Using $GLOBALS: It is used to reference all v 3 min read Removing occurrences of a specific character from end of a string in PHPThere is a lot of options to remove all specific characters at the end of a string. Some of them are discussed below:Using rtrim() functionThis function is an inbuilt function in PHP that removes whitespaces or other characters (if specified) from the right side of the string.Syntax:rtrim( $string, 3 min read How to convert string to boolean in PHP?Given a string and the task is to convert given string to its boolean. Use filter_var() function to convert string to boolean value. Examples: Input : $boolStrVar1 = filter_var('true', FILTER_VALIDATE_BOOLEAN); Output : true Input : $boolStrVar5 = filter_var('false', FILTER_VALIDATE_BOOLEAN); Output 2 min read Generating Random String Using PHPGenerating a random string involves creating a sequence of characters where each character is selected unpredictably from a defined set (e.g., letters, numbers, symbols). This process is used in programming to produce unique identifiers, passwords, tokens, or keys for security and randomness in appl 2 min read How to generate a random, unique, alphanumeric string in PHPThere are many ways to generate a random, unique, alphanumeric string in PHP which are given below: Table of ContentUsing str_shuffle() FunctionUsing md5() FunctionUsing sha1() FunctionUsing random_bytes() FunctionUsing random_int() in a Custom FunctionUsing uniqid() with more_entropy parameterUsing 4 min read Remove new lines from string in PHPGiven a multiple line sentence or statement the task is to convert the whole statement in a single line. See the example below. Examples: Input : Hello welcome to geeksforgeeks.Output : Hello welcome to geeksforgeeks.Remove the new line between Hello and geeksforgeeks.Input : I love geeksforgeeksOut 2 min read Insert string at specified position in PHPGiven a sentence, a string and the position, the task is to insert the given string at the specified position. We will start counting the position from zero. See the examples below. Input : sentence = 'I am happy today.' string = 'very' position = 4 Output :I am very happy today.Input : sentence = ' 3 min read PHP Program to check a string is a rotation of another stringGiven the two strings we have to check if one string is a rotation of another string. Examples: Input : $string1 = "WayToCrack", $string2 = "CrackWayTo"; Output : Yes Input : $string1 = "WillPower" $string2 = "lliW"; Output : No. The above problem can be easily solved in other languages by concatena 3 min read PHP Classes ProgramsPHP Access ModifiersIn object-oriented programming, access specifiers are also known as access modifiers. These specifiers control how and where the properties or methods of a class can be accessed, either from inside the class, from a subclass, or from outside the class. PHP supports three primary access specifiers: p 4 min read PHP | Constructors and DestructorsIn PHP, constructors and destructors are special methods that are used in object-oriented programming (OOP). They help initialize objects when they are created and clean up resources when the object is no longer needed. These methods are part of the class lifecycle.In this article, we will discuss w 5 min read PHP | Type Casting and Conversion of an Object to an Object of other classGiven a PHP class object and the task is to convert or cast this object into object of another class. Approach 1: Objects which are instances of a standard pre-defined class can be converted into object of another standard class. Example: php <?php // PHP program to show // standard type casting 3 min read PHP | Type Casting and Conversion of an Object to an Object of other classGiven a PHP class object and the task is to convert or cast this object into object of another class. Approach 1: Objects which are instances of a standard pre-defined class can be converted into object of another standard class. Example: php <?php // PHP program to show // standard type casting 3 min read How to merge two PHP objects?Merging two PHP objects means combining their properties and values into a single object. This is typically done by copying the properties from one object to another, ensuring that both objects' data are preserved in the resulting merged object without overwriting critical values.Here we have some c 2 min read Abstract Classes in PHPAbstract classes in PHP are classes that may contain at least one abstract method. Unlike C++, abstract classes in PHP are declared using the abstract keyword. The purpose of abstract classes is to enforce that all derived classes implement the abstract methods declared in the parent class. An abstr 2 min read PHP JSON ProgramsHow to parse a JSON File in PHP?Parsing JSON in PHP is simple and efficient. JSON (JavaScript Object Notation) is a lightweight format used to store data in key-value pairs. PHP offers built-in functions to handle JSON encoding and decoding, making it easy to work with JSON data.JSON Syntax OverviewThe general syntax of a JSON obj 3 min read How to generate Json File in PHP ?In this article, we are going to generate a JSON file in PHP by using an array. JSON stands for JavaScript object notation, which is used for storing and exchanging data. JSON is text, written with JavaScript object notation. Structure: {"data":[ { "sub_data1":"value1", "sub_data2":"value2","sub_dat 3 min read How to Convert JSON file into CSV in PHP ?In this article, we are going to see how to convert JSON data into a CSV file using PHP. JSON (JavaScript Object Notation) is a dictionary-like notation that can be used to structuring data. It is stored with the extension .json, for example - geeksforgeeks.json On the other hand, CSV (or Comma Sepa 2 min read How to Convert XML data into JSON using PHP ?In this article, we are going to see how to convert XML data into JSON format using PHP. Requirements: XAMPP Server Introduction: PHP stands for hypertext preprocessor, which is used to create dynamic web pages. It also parses the XML and JSON data. XML stands for an extensible markup language in wh 3 min read How to Insert JSON data into MySQL database using PHP?To insert JSON data into MySQL database using PHP, use the json_decode function in PHP to convert JSON object into an array that can be inserted into the database. Here, we are going to see how to insert JSON data into MySQL database using PHP through the XAMPP server in a step-by-step way. JSON Str 3 min read How to convert PHP array to JavaScript or JSON ?PHP provides a json_encode() function that converts PHP arrays into JavaScript. Technically, it is in JSON format. JSON stands for JavaScript Object Notation. Statement: If you have a PHP array and you need to convert it into the JavaScript array so there is a function provided by PHP that will easi 2 min read How to receive JSON POST with PHP ?In this article, we will see how to retrieve the JSON POST with PHP, & will also see their implementation through the examples. First, we will look for the below 3 features: php://input: This is a read-only stream that allows us to read raw data from the request body. It returns all the raw data 2 min read How to use cURL to Get JSON Data and Decode JSON Data in PHP ?In this article, we are going to see how to use cURL to Get JSON data and Decode JSON data in PHP.cURL: It stands for Client URL.It is a command line tool for sending and getting files using URL syntax.cURL allows communicating with other servers using HTTP, FTP, Telnet, and more.Approach:We are goi 2 min read PHP File Systems ProgramsHow to Create a Folder if It Doesn't Exist in PHP ?We can easily create a folder in PHP, but before that, you have to check if the folder or directory already exists or not. So In this article, you will learn both to Check and Create a folder or directory in PHP. Methods: file_exists(): It is an inbuilt function that is used to check whether a file 3 min read How to check if File Exists in PHP ?To check whether any file is existing or not then we can use the below-mentioned PHP function. To find the existence of the files, we use file_exists() function. This function is used to check whether a file or directory exists or not. Syntax: file_exists( $path ) Parameters: This function accept on 1 min read How to write Into a File in PHP ?In this article, we are going to discuss how to write into a text file using the PHP built-in fwrite() function. The fwrite() function is used to write into the given file. It stops at the end of the file or when it reaches the specified length passed as a parameter, whichever comes first. The file 2 min read Deleting all files from a folder using PHPIn PHP, files from a folder can be deleted using various approaches and inbuilt methods such as unlink, DirectoryIterator and DirectoryRecursiveIterator. Some of these approaches are explained below: Approach 1: Generate a list of files using glob() method Iterate over the list of files. Check wheth 3 min read How to get file name from a path in PHP ?In this article, we will see how to get the file name from the path in PHP, along with understanding its implementation through the examples. We have given the full path & we need to find the file name from the file path. For this, we will following below 2 methods: Using the basename() function 2 min read How to Log Errors and Warnings into a File in PHP?In PHP, errors and warnings can be logged into a file by using a PHP script and changing the configuration of the php.ini file. Two such approaches are mentioned below: Approach 1: Using error_log() FunctionThe error_log() function can be used to send error messages to a given file. The first argume 3 min read How to extract extension from a filename using PHP ?In this article, we will see how to extract the filename extension in PHP, along with understanding their implementation through the examples. There are a few different ways to extract the extension from a filename with PHP, which is given below: Using pathinfo() function: This function returns info 2 min read How to get names of all the subfolders and files present in a directory using PHP?Given the path of the folder and the task is to print the names of subfolders and files present inside them. Explanation: In our PHP code, initially, it is checked whether provided path or filename is a directory or not using the is_dir() function. Now, we open the directory using opendir() function 2 min read Article Tags : Web Technologies PHP PHP-string Like