Ticket #20537: 20537.2.diff

src/wp-cron.php

@@ -58 +58 @@
 if ( false === $crons = _get_cron_array() )
         die();
 
+$spawn_cron  = true;
+$current_site = null;
+if ( is_multisite() ) {
+        $current_site = get_blog_details();
+        // Don't process cron for suspended blogs.
+        if ( $current_site->archived || $current_site->spam || $current_site->deleted ) {
+                $spawn_cron = false;
+        }
+}
+/** This filter is documented in wp-includes/cron.php */
+if ( true === apply_filters( 'spawn_cron_for_site', $spawn_cron, $current_site ) ) {
+        die();
+}
+unset( $spawn_cron, $current_site );
+
 $keys = array_keys( $crons );
 $gmt_time = microtime( true );
 

src/wp-includes/cron.php

@@ -342 +342 @@
         if ( false === $crons = _get_cron_array() )
                 return;
 
+        $spawn_cron  = true;
+        $current_site = null;
+        if ( is_multisite() ) {
+                $current_site = get_blog_details();
+                // Don't process cron for suspended sites.
+                if ( $current_site->archived || $current_site->spam || $current_site->deleted ) {
+                        $spawn_cron = false;
+                }
+        }
+        /**
+         * Filter whether to spawn cron for a site.
+         *
+         * @since 4.6.0
+         *
+         * @param bool         $spawn_cron   Whether to spawn a cron process for a site. Defaults to true for single
+         *                                   site and non-suspended sites in multisite. False for suspended sites
+         *                                   in multisite.
+         * @param null|WP_Site $current_site Null if single site. The site for which cron will spawn if multisite.
+         */
+        if ( false === apply_filters( 'spawn_cron_for_site', $spawn_cron, $current_site ) ) {
+                return;
+        }
+        unset( $spawn_cron, $current_site );
+
         $gmt_time = microtime( true );
         $keys = array_keys( $crons );
         if ( isset($keys[0]) && $keys[0] > $gmt_time )