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

Using $_SERVER['PHP_SELF'] instead of $php_self in PHP code is significant because $_SERVER['PHP_SELF'] is a predefined variable that contains the filename of the currently executing script. This ensures that the correct filename is always used, regardless of the server or configuration. Using $php_self may not work in all environments and can lead to errors or security vulnerabilities. 

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

Keywords

$_SERVER PHP_SELF variable security form submission

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