How can PHP be used to define a variable in a form based on user input?

To define a variable in a form based on user input in PHP, you can use the $_POST superglobal array to retrieve the user input from the form and assign it to a variable. This allows you to store and manipulate the user input within your PHP code. 

<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $user_input = $_POST['user_input'];
    // Use the $user_input variable as needed in your PHP code
}
?>

<form method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>">
    <input type="text" name="user_input">
    <button type="submit">Submit</button>
</form>

Keywords

PHP variable form user input define

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