Ticket #42072: 42072.2.diff

src/wp-includes/ms-functions.php

@@ -1356 +1356 @@
  */
 function domain_exists( $domain, $path, $network_id = 1 ) {
         $path = trailingslashit( $path );
-        $args = array(
-                'network_id' => $network_id,
-                'domain'     => $domain,
-                'path'       => $path,
-                'fields'     => 'ids',
-        );
-        $result = get_sites( $args );
-        $result = array_shift( $result );
+
+        $result = get_site_by( 'url', $domain . $path, $network_id );
 
         /**
          * Filters whether a site name is taken.