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✏️ Editing: vars-php-multisite.php

<?php
			global $PHP_SELF;
if ( is_admin() ) {
	// wp-admin pages are checked more carefully
	if ( is_network_admin() ) {
		preg_match( '#/wp-admin/network/?(.*?)$#i', $PHP_SELF, $self_matches );
	} elseif ( is_user_admin() ) {
		preg_match( '#/wp-admin/user/?(.*?)$#i', $PHP_SELF, $self_matches );
	} else {
		preg_match( '#/wp-admin/?(.*?)$#i', $PHP_SELF, $self_matches );
	}
	$pagenow = $self_matches[1];
	$pagenow = trim( $pagenow, '/' );
	$pagenow = preg_replace( '#\?.*?$#', '', $pagenow );
	if ( '' === $pagenow || 'index' === $pagenow || 'index.php' === $pagenow ) {
		$pagenow = 'index.php';
	} else {
		preg_match( '#(.*?)(/|$)#', $pagenow, $self_matches );
		$pagenow = strtolower( $self_matches[1] );
		if ( '.php' !== substr( $pagenow, -4, 4 ) ) {
			$pagenow .= '.php'; // for Options +Multiviews: /wp-admin/themes/index.php (themes.php is queried)
		}
	}
} else {
	if ( preg_match( '#([^/]+\.php)([?/].*?)?$#i', $PHP_SELF, $self_matches ) ) {
		$pagenow = strtolower( $self_matches[1] );
	} else {
		$pagenow = 'index.php';
	}
}
			unset( $self_matches );

MR SKB