What are the drawbacks of using $PHP_SELF instead of $_SERVER['PHP_SELF'] in form action attributes in PHP scripts?

Using $PHP_SELF directly in form action attributes can pose a security risk as it can be manipulated by attackers to execute malicious code. It is recommended to use $_SERVER['PHP_SELF'] instead, as it provides a more secure way to access the PHP script filename. 

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

Keywords

$PHP_SELF $_SERVER form action attributes drawbacks

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