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Uploaded byJaydeep Kale
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Comprehensive Guide to PHP Forms: Methods, Superglobals, and Data Retrieval

Learn about PHP form handling including action and method attributes, GET vs POST methods, superglobals, and retrieving data from radio buttons, checkboxes, and dropdown lists.

Education◦
PHP Form Prepared By:- Kale J. N. Assistant Professor, Computer Engineering, Sanjivani College of Engineering, Kopargaon Prepared By: Kale J. N.
action attribute:- The action attribute specifies where the form data will be sent after the user clicks the submit button. It tells the browser which page or script will process the form data Prepared By: Kale J. N.
<form action="welcome.php" method="post"> Name: <input type="text" name="name"> <input type="submit"> </form> • //When the user clicks Submit: • //The form data goes to welcome.php • • If action="" then Then the form submits to the same page. Prepared By: Kale J. N.
Method attribute • The method attribute specifies how the form data will be sent to the server. • There are two main methods: • GET • POST Prepared By: Kale J. N.
GET Method <form action="welcome.php" method="get"> Name: <input type="text" name="name"> <input type="submit"> </form> //After submission, URL becomes: //welcome.php?name=sai • In GET method, form data is sent through the URL. • Characteristics of GET • Data is visible in URL • Limited data size • Less secure Prepared By: Kale J. N.
POST Method <form action="welcome.php" method="post"> Name: <input type="text" name="name"> <input type="submit"> </form> //URL will look like: //welcome.php • In POST method, form data is sent inside the HTTP request body, not visible in URL. • Data is hidden. Prepared By: Kale J. N.
Difference Between GET and POST Feature GET POST Data visibility Visible in URL Hidden Security Less secure More secure Data size Limited Large Usage Search forms Login, registration Prepared By: Kale J. N.
Superglobals • PHP provides 9 superglobal variables: • $GLOBALS • $_SERVER • $_REQUEST • $_POST • $_GET • $_FILES • $_ENV • $_COOKIE • $_SESSION Prepared By: Kale J. N. • Superglobals are built-in PHP variables that are available in all scopes of a PHP script. • This means: • They can be accessed anywhere in the program
$_GET Superglobal • Definition • $_GET is used to collect form data sent using the GET method. • The data is visible in the URL. <?php $name = $_GET['name']; echo "Hello " . $name; ?> Prepared By: Kale J. N.
$_POST Superglobal • Definition • $_POST is used to collect form data sent using POST method. • The data is not visible in the URL. <?php $name = $_POST['name']; echo "Hello " . $name; ?> Prepared By: Kale J. N.
Retrieving Data (Radio Button) <input type="radio" name="gender" value="Male"> Male <input type="radio" name="gender" value="Female"> Female $gender = $_POST['gender']; Prepared By: Kale J. N.
Retrieving Data (Check box) <input type="checkbox" name="hobby[]" value="Reading"> Reading <input type="checkbox" name="hobby[]" value="Music"> Music $hobby = $_POST['hobby']; foreach($hobby as $h) { echo $h; } Prepared By: Kale J. N.
Retrieving Data (Drop down List) <select name="city"> <option value="Nashik">Nashik</option> <option value="Pune">Pune</option> </select> $hobby = $_POST['hobby']; foreach($hobby as $h) { echo $h; } Prepared By: Kale J. N. $city = $_POST['city'];
Prepared By: Kale J. N.