Downloaded 158 times
![Multidimensional Arrays $multiD = array ( "fruits" => array("myfavorite" => "orange", "yuck" => "banana", "yum" => "apple"), "numbers" => array(1, 2, 3, 4, 5, 6), "holes" => array("first", 5 => "second", "third") ); Getting Data into array $pieces[5] = "poulet resistance"; -----direct assignment From a file $pizza = file(./our_pizzas.txt) $pieces = explode(" ", $pizza);](https://image.slidesharecdn.com/php-180105195714/75/Php-Lecture-Notes-19-2048.jpg)
![PHP $_GLOBALS <!DOCTYPE html> <html> <body> <?php $x = 75; $y = 25; function addition() { $GLOBALS['z'] = $GLOBALS['x'] + $GLOBALS['y']; } addition(); echo $z; ?> </body> </html> OUTPUT 100](https://image.slidesharecdn.com/php-180105195714/75/Php-Lecture-Notes-35-2048.jpg)
![PHP $_SERVER <?php echo $_SERVER['PHP_SELF']; echo "<br>"; echo $_SERVER['SERVER_NAME']; echo "<br>"; echo $_SERVER['HTTP_HOST']; echo "<br>"; echo $_SERVER['HTTP_REFERER']; echo "<br>"; echo $_SERVER['HTTP_USER_AGENT']; echo "<br>"; echo $_SERVER['SCRIPT_NAME']; ?> OUTPUT php/demo_global_server.php www.w3schools.com www.w3schools.com http://www.w3schools.com/php/showphp.asp?filename=demo_global_server Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/48.0.2564.109 Safari/537.36 / php/demo_global_server.php](https://image.slidesharecdn.com/php-180105195714/75/Php-Lecture-Notes-36-2048.jpg)
![PHP $_REQUEST form method="post" action="<?php echo $_SERVER['PHP_SELF'];?>"> Name: <input type="text" name="fname"> <input type="submit"> </form> <?php if ($_SERVER["REQUEST_METHOD"] == "POST") { // collect value of input field $name = $_REQUEST['fname']; if (empty($name)) { echo "Name is empty"; } else { echo $name; } } ?>](https://image.slidesharecdn.com/php-180105195714/75/Php-Lecture-Notes-37-2048.jpg)
![Form Elements <form method="post" action="<?php echo htmlspecialchars($_ SERVER["PHP_SELF"]);?>"> PHP Form Security <form method="post" action="<?php echo $_SERVER["PHP_SELF"];?>"> <form method="post" action="test_form.php"> http://www.example.com/test_form.php/%22%3E%3Cscript%3Ealer <form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>">](https://image.slidesharecdn.com/php-180105195714/75/Php-Lecture-Notes-40-2048.jpg)
![Validate Form use the htmlspecialchars() function with the PHP trim() function with the PHP stripslashes() function) $_POST variable with the test_input() function <?php // define variables and set to empty values $name = $email = $gender = $comment = $website = ""; if ($_SERVER["REQUEST_METHOD"] == "POST") { $name = test_input($_POST["name"]); $email = test_input($_POST["email"]); $website = test_input($_POST["website"]); $comment = test_input($_POST["comment"]); $gender = test_input($_POST["gender"]); } function test_input($data) { $data = trim($data); $data = stripslashes($data); $data = htmlspecialchars($data); return $data; } ?>](https://image.slidesharecdn.com/php-180105195714/75/Php-Lecture-Notes-41-2048.jpg)
Php Lecture Notes
- 1. PHPWhat can PHPdo? What is a PHP File? Why PHP? Mrs .C.Santhiya Assistant Professor TCE,Madurai
- 2. Background PHP isserver side scripting system. PHP stands for "PHP: Hypertext Preprocessor“ Syntax based on Perl, Java, and C Very good for creating dynamic content Powerful, but somewhat risky! If you want to focus on one system for dynamic content, this is a good one to choose
- 3. PHP Scripts Typicallyfile ends in .php--this is set by the web server configuration Separated in files with the <?php ?> tag php commands can make up an entire file, or can be contained in html--this is a choice…. Program lines end in ";" or you get an error Server recognizes embedded script and executes Result is passed to browser, source isn't visible <?php $myvar = "Hello World!"; echo $myvar;?>
- 4. Two Ways You canembed sections of php inside html: <BODY> <P> <?php $myvar = "Hello World!"; echo $myvar;</P> </BODY> Or you can call html from php: <?php echo "<html><head><title>Howdy</title> … ?>
- 5. Code: <?php echo "Hello world!"; ?> Runa php file http://www.wampserver.com Go to start & start wamp server Open browser & http://local host Put php file in www folder c://wamp/www http:///local host/filename.php
- 6.
- 7. Literals All stringsmust be enclosed in single of doublequotes: ‘Hello’ or “Hello”. Numbers are not in enclosed in quotes: 1 or 45 or34.564 Booleans (true/false) can be written directly as true or false.
- 8. Comments // This isa comment # This is also a comment /* This is a comment that is spread over multiple lines */
- 9. Displaying Data There aretwo language constructs available todisplay data: print() and echo(). They can be used with or without brackets. Note that the data ‘displayed’ by PHP is actually parsed by your browser as HTML. View source to see actual output. <?php echo ‘Hello World!<br />’; echo(‘Hello World!<br />’); print ‘Hello World!<br />’; print(‘Hello World!<br />’); ?>
- 10. Escaping Characters <?php // ClaireO’Reilly said “Hello”. echo ‘Claire O’Reilly ’; echo “said ”Hello”.”; ?>
- 11. Variables: What arethey? labelled ‘places’ are called VARIABLES $ followed by variable name Case sensitive $variable differs from $Variable Stick to lower-case to be sure! Name must started with a letter or an underscore Followed by any number of letters, numbers and underscores <?php $name = ‘Phil’; $age = 23; echo $name; echo ’ is ‘; echo $age; // Phil is 23 ?>
- 12. Variables: What arethey? Assigned by value $foo = "Bob"; $bar = $foo; Assigned by reference, this links vars $bar = &$foo Some are preassigned, server and env vars For example, there are PHP vars, eg. PHP_SELF, HTTP_GET_VARS,etc
- 13. Constants Constants (unchangeablevariables) can also be defined. Each constant is given a name (note no preceding dollar is applied here). By convention, constant names are usually in UPPERCASE <?php define(‘NAME’,‘Phil’); define(‘AGE’,23); echo NAME; echo ’ is ‘; echo AGE; // Phil is 23 ?>
- 14. Operators Arithmetic (+, -,*, /, %) and String (.)Arithmetic (+, -, *, /, %) and String (.) Assignment (=) and combined assignmentAssignment (=) and combined assignment $a = 3; $a += 5; // sets $a to 8; $b = "Hello "; $b .= "There!"; // sets $b to "Hello There!"; Bitwise (&, |, ^, ~, <<, >>)Bitwise (&, |, ^, ~, <<, >>) $a ^ $b ~ $a Comparison (==, ===, !=, !==, <, >, <=, >=)Comparison (==, ===, !=, !==, <, >, <=, >=) Error Control (@)Error Control (@) Execution (` is similar to the shell_exec() function)Execution (` is similar to the shell_exec() function) Incrementing/DecrementingIncrementing/Decrementing
- 15. Logical $a and $bAnd True if both $a and $b are true. $a or $b Or True if either $a or $b is true. $a xor $b Xor True if either $a or $b is true, but not both. ! $a Not True if $a is not true. $a && $b And True if both $a and $b are true. ++$a (Increments by one, then returns++$a (Increments by one, then returns $a.)$a.) $a++ (Returns $a, then increments $a$a++ (Returns $a, then increments $a by one.)by one.) --$a--$a (Decrements $a by one, then(Decrements $a by one, then returns $a.)returns $a.) $a--$a-- (Returns $a, then decrements $a(Returns $a, then decrements $a by one.)by one.)
- 16. Control Structures Wide Varietyavailable if, else, elseif while, do-while for, foreach break, continue, switch require, include, require_once, include_once
- 17.
- 18. Arrays $my_array = array(1,2, 3, 4, 5); $pizza = "piece1 piece2 piece3 piece4 piece5 piece6"; $pizza = file(./our_pizzas.txt) $pieces = explode(" ", $pizza); Text versus Keys $my_text_array = array(first=>1, second=>2, third=>3); Walking Arrays $colors = array('red', 'blue', 'green', 'yellow'); ss foreach ($colors as $color) { echo "Do you like $color?n"; }
- 19. Multidimensional Arrays $multiD =array ( "fruits" => array("myfavorite" => "orange", "yuck" => "banana", "yum" => "apple"), "numbers" => array(1, 2, 3, 4, 5, 6), "holes" => array("first", 5 => "second", "third") ); Getting Data into array $pieces[5] = "poulet resistance"; -----direct assignment From a file $pizza = file(./our_pizzas.txt) $pieces = explode(" ", $pizza);
- 20.
- 21.
- 22.
- 23.
- 26. Embedding PHP inWeb Pages XML Style <?php echo "Hello, world"; ?> SGML Style <? echo "Hello, world"; ?> ASP Style <% echo "Hello, world"; %> Script Style <script language="php"> echo "Hello, world"; </script> Echoing Content Directly <input type="text" name="first_name" value="<?="Rasmus"; ?>">
- 27. Functions Defining a Function function functionName() { code to be executed; } <?php function writeMsg() { echo "Hello world!"; } writeMsg(); // calling the function ?> Built-In Functions echostrrev(" .dlrow olleH"); Hello world. echo str_repeat("Hip ", 2); Hip Hip echo strtoupper("hooray!"); HOORAY <?php // heck of a function phpinfo();
- 28.
- 29. Arguments function howdy($lang) { if( $lang == 'es' ) return "Hola"; if ( $lang == 'fr' ) return "Bonjour"; return "Hello"; } print howdy('es') . " Glennn"; print howdy('fr') . " Sallyn"; Hola Glenn Bonjour Sally
- 30. Call By Value function double($alias) { $alias= $alias * 2; return $alias; } $val = 10; $dval = double($val); echo "Value = $val Doubled = $dvaln"; Value = 10 Doubled = 20
- 31. Call By Reference function triple(&$realthing) { $realthing= $realthing * 3; } $val = 10; triple($val); echo "Triple = $valn"; Triple = 30
- 32. Normal Scope function tryzap() { $val= 100; } $val = 10; tryzap(); echo "TryZap = $valn"; TryZap = 10
- 33. Global Scope function dozap() { global$val; $val = 100; } $val = 10; dozap(); echo "DoZap = $valn“ DoZap = 100
- 34.
- 35.
- 36.
- 37.
- 38.
- 39. Forms GET vs. POST $_GET array of variables passed to the current script via the URL parameters. visible to everyone Limitation is about 2000 characters. GET may be used for sending non-sensitive data. $_POST array of variables passed to the current script via the HTTP POST method. invisibleto others No Limits Developers prefer POST for sending form data
- 40.
- 41.
- 42. References http://www.php.net <-- phphome page http://www.phpbuilder.com/ http://www.devshed.com/ http://www.phpmyadmin.net/ http://www.hotscripts.com/PHP/ http://geocities.com/stuprojects/ChatroomDescription.htm http://www.academic.marist.edu/~kbhkj/chatroom/chatroom.htm http://www.aus-etrade.com/Scripts/php.php http://www.codeproject.com/asp/CDIChatSubmit.asp http://www.php.net/downloads <-- php download page http://www.php.net/manual/en/install.windows.php <-- php installation manual http://php.resourceindex.com/ <-- PHP resources like sample programs, text book references, etc. http://www.daniweb.com/techtalkforums/forum17.html php forums