How can PHP_SELF be properly used in form actions to avoid errors related to server variables?

When using PHP_SELF in form actions, it can lead to security vulnerabilities such as cross-site scripting attacks. To avoid these errors, it is recommended to use htmlspecialchars() function to sanitize the input and prevent malicious code injection. 

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

Keywords

PHP_SELF form actions server variables errors proper use

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