What potential issue could arise when using header("Location: " . $script_url . "/" . $_SERVER['PHP_SELF'] . ""); in PHP?

Using $_SERVER['PHP_SELF'] directly in the header("Location: ") function can lead to a potential security vulnerability known as a header injection attack. To prevent this issue, it's recommended to sanitize and validate the $_SERVER['PHP_SELF'] variable before using it in the header function. One way to do this is by using the basename() function to extract the filename from the path. 

$script_url = "https://example.com";
$php_self = basename($_SERVER['PHP_SELF']);
header("Location: " . $script_url . "/" . $php_self);
exit;

Keywords

header Location $script_url $_SERVER['PHP_SELF'] redirection

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