How can the use of the PHP_SELF variable affect the form submission process and what precautions should be taken when using it in a form action attribute?

Using the PHP_SELF variable in the form action attribute can make the form vulnerable to cross-site scripting (XSS) attacks. To prevent this, it is recommended to use htmlspecialchars() function to sanitize the PHP_SELF variable before using it in the form action attribute. 

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

Keywords

PHP_SELF variable form submission precautions form action attribute security.

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