What is the significance of using $_SERVER['PHP_SELF'] instead of $PHP_SELF in PHP scripts?

Using $_SERVER['PHP_SELF'] instead of $PHP_SELF in PHP scripts is significant because $PHP_SELF is a variable that is not predefined in PHP, while $_SERVER['PHP_SELF'] is a predefined variable that contains the filename of the currently executing script. By using $_SERVER['PHP_SELF'], you ensure that you are getting the correct filename of the script, which is important for security purposes when working with forms and URLs. 

<form action="<?php echo htmlspecialchars($_SERVER['PHP_SELF']); ?>" method="post">
    // Form content here
</form>

Keywords

$_SERVER PHP_SELF superglobal security vulnerability

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