How can PHP reserved variables like $_POST be used to retrieve and process data submitted through form elements?

To retrieve and process data submitted through form elements in PHP, you can use reserved variables like $_POST. These variables store data sent to the server using the HTTP POST method. By accessing $_POST['form_field_name'], you can retrieve the value of a specific form field submitted by the user. 

<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $username = $_POST['username'];
    $password = $_POST['password'];
    
    // Process the submitted data
}
?>

Keywords

PHP reserved variables $_POST form elements data processing

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