How can the use of $PHP_SELF be replaced with $_SERVER['PHP_SELF'] to avoid undefined variable errors in PHP form processing?

When using $PHP_SELF in PHP form processing, it may lead to undefined variable errors because it is not a predefined variable. To avoid this issue, you can use $_SERVER['PHP_SELF'] which is a predefined variable that contains the filename of the currently executing script. By using $_SERVER['PHP_SELF'], you can ensure that the variable is always defined and prevent any errors in your form processing code. 

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

Keywords

$PHP_SELF $_SERVER undefined variable form processing error

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