What does the condition in the Bitrix template ["PHP_SELF"] == "/bitrix/urlrewrite.php") mean?

Question

1C-Bitrix

There is a condition in the template footer

<? if($_SERVER["PHP_SELF"] == "/bitrix/urlrewrite.php"){ ?>
<style>
.footer.fwhite a.call{
    color: #e54545;
    text-decoration: underline;
}

What does this mean? How are pages determined for changing the style for this condition?

Answer 1

Pages that work in the CNC