PHP string-part 1

PHP string-part 1

• 1.
  Strings TYBSC Comp Sci. Chapter2- Functions & Strings monica deshmane(H.V.Desai college) 1
• 2.
  Points to learn •String • Types of strings in PHP • Printing functions • Basic functions of string monica deshmane(H.V.Desai college) 2
• 3.
  String types • 1.Single quoted Strings ‘’ Ex. $str=‘hi’; $str1=‘nhi’ echo “$str1”; • 2. Double quoted String “ ” Strings interpolate & expand by escape sequences. • Variable Interpolation- Interpolation is replacing variable names in string with values of those variables. Ex.$str1=“nhi” echo “$str1”; monica deshmane(H.V.Desai college) 3
• 4.
  String types • 3.Here Documents(heredoc) heredoc allows multiline String. <<< identifier is used in php for displaying string using heredoc. <?php $str = <<< my_doc ‘This is an example. This is used for multiline.’ my_doc; echo $str; ?> //may use ‘ or “ or no quotes. • 4. New Documents(Newdoc) this allows multiline String same as heredoc just put name in single quotes. Ex. <?php $str = <<< ‘my_doc’…. monica deshmane(H.V.Desai college) 4
• 5.
  Printing Strings 1. Echo– This allows to print many values at a time. echo "Hello Abcd"; echo ("Hello Abcd"); echo "Hello Abcd", "How are u?"; //echo ("Hello Abcd", "How are u?"); - not allowed 2. print() This function returns true or false boolean value. if (print(“Hello PHP”)) { echo “String is displayed successfully”; } monica deshmane(H.V.Desai college) 5
• 6.
  Printing Strings 3. printf()- function used to print formatted String output. $str = “Abc”; $age=20.5; printf(“%s is %d years old”, $str, $age); 4.print_r() – function displays what is passed to it, It will not convert everything into string as echo and print(). $Student = array(‘name’ => ‘A’, ‘RollNo’ => 100, ‘Class’ => ‘TY’); print_r($Student); Output: Array ( [name] => A [RollNo] => 100 [Class] => TY ) monica deshmane(H.V.Desai college) 6
• 7.
  Printing Strings 5. var_dump()– It is preferred over print_r() for debugging. This function displays PHP value in human readable format. Eg: <?php $b = 3.1; $c = true; var_dump($b, $c); ?> Output: float(3.1) bool(true) monica deshmane(H.V.Desai college) 7
• 8.
  Printing Strings var_dump(array('name' =>John, 'age' => 35)); Output: array(2) { ["name"]=> string(4) “John" ["age"]=> int(35) } 6.sprintf() To print string with format Ex. $str=sprintf(“hi %s is %s”,”this “,”php”); Echo $str; monica deshmane(H.V.Desai college) 8
• 9.
  revise • Printing functions 1.Echo 2. Print 3. printf 4. Sprintf 5. Print_r 6. Var_dump monica deshmane(H.V.Desai college) 9
• 10.
  Calculating length ofString strlen() What we require to compute length of string? Syntax: count= strlen(String variable); Example: $len = strlen($str); monica deshmane(H.V.Desai college) 10
• 11.
  Calculating length ofString $str = “Hello, world”; $len = strlen($str); monica deshmane(H.V.Desai college) 11 Accessing Individual Characters $str = “Welcome”; for ($i=0; $i < strlen($str); $i++) { printf(“%d is %s”,$i, $str{$i}); }
• 12.
  Removing Whitespaces trim() $str1 =ltrim($title); //leading spaces $str2 = rtrim($title); //trailing spaces $str3 = trim($title);//all spaces monica deshmane(H.V.Desai college) 12
• 13.
  Removing Whitespaces $title =“ Welcome “; $str1 = ltrim($title); //leading spaces $str2 = rtrim($title); //trailing spaces $str3 = trim($title); //all spaces echo “$str1 $str2 $str3”; monica deshmane(H.V.Desai college) 13
• 14.
  Changing Case strtolower($title)); strtoupper($title)); ucfirst($title)); ucwords($title)); monica deshmane(H.V.Desaicollege) 14
• 15.
  Changing Case $title =“hELLO welcome“; printf(strtolower($title)); //hello welcome printf(strtoupper($title)); //HELLO WELCOME printf(ucfirst($title)); //HELLO welcome printf(ucwords($title)); //HELLO Welcome Note: ucfirst() works on first character of whole string and ucwords works on first character of each words in the string to convert it in uppercase. monica deshmane(H.V.Desai college) 15
• 16.
  End of Presentation monicadeshmane(H.V.Desai college) 16