How can the use of $_SERVER['PHP_SELF'] impact the execution of PHP scripts?

Using $_SERVER['PHP_SELF'] in PHP scripts can potentially expose your application to cross-site scripting (XSS) attacks. It is recommended to sanitize and validate the input before using it to prevent malicious code injection. One way to mitigate this risk is to use htmlspecialchars() function to escape special characters and prevent XSS attacks. 

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

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$_SERVER['PHP_SELF'] execution impact PHP scripts security

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