What is the potential issue with using $HTTP_POST_VARS in PHP and what should be used instead?

Using $HTTP_POST_VARS in PHP is not recommended as it is a deprecated feature and has been removed in newer versions of PHP. Instead, you should use the $_POST superglobal array to access POST data in PHP. 

// Using $_POST instead of $HTTP_POST_VARS
if(isset($_POST['username'])) {
    $username = $_POST['username'];
    // Rest of your code here
}

Keywords

$HTTP_POST_VARS deprecated superglobal $_POST security vulnerability

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