What potential issue arises when using "<?$_SERVER['PHP_SELF']?>" in the code?
Using `<?$_SERVER['PHP_SELF']?>` in the code can potentially lead to a Cross-Site Scripting (XSS) vulnerability if the user input is not properly sanitized. To prevent this issue, it is recommended to use `htmlspecialchars()` function to escape any HTML special characters before displaying user input.
<?php echo htmlspecialchars($_SERVER['PHP_SELF']); ?>
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