Ticket #20537: 20537-with-filter.patch

src/wp-cron.php

@@ -55 +55 @@
         return $value;
 }
 
-if ( false === $crons = _get_cron_array() )
+if ( false === $crons = _get_cron_array() ) {
         die();
+}
+
+$should_skip = false;
+// Don't process cron for suspended blogs.
+if ( is_multisite() && ( $current_blog->archived || $current_blog->spam || $current_blog->deleted ) ) {
+        $should_skip = true;
+}
+/** This filter is documented in wp-includes/cron.php */
+if ( true === apply_filters( 'skip_cron_for_blog', $should_skip, $current_blog ) ) {
+        return;
+}
+unset( $should_skip );
 
 $keys = array_keys( $crons );
 $gmt_time = microtime( true );

src/wp-includes/cron.php

@@ -331 +331 @@
  * @since 2.1.0
  */
 function wp_cron() {
+        global $current_blog;
+
         // Prevent infinite loops caused by lack of wp-cron.php
-        if ( strpos($_SERVER['REQUEST_URI'], '/wp-cron.php') !== false || ( defined('DISABLE_WP_CRON') && DISABLE_WP_CRON ) )
+        if ( strpos($_SERVER['REQUEST_URI'], '/wp-cron.php') !== false || ( defined('DISABLE_WP_CRON') && DISABLE_WP_CRON ) ) {
                 return;
+        }
+
+        if ( false === $crons = _get_cron_array() ) {
+                return;
+        }
 
-        if ( false === $crons = _get_cron_array() )
+        $should_skip = false;
+        // Don't process cron for suspended blogs.
+        if ( is_multisite() && ( $current_blog->archived || $current_blog->spam || $current_blog->deleted ) ) {
+                $should_skip = true;
+        }
+        /**
+         * Allow to either force skip a cron run or to force cron to run even for suspended blogs.
+         *
+         * @param bool        $should_skip  Whether the cron run is going to be skipped.
+         *                                  Will be `false` for single-site or non-suspended multi-site blogs
+         *                                  or `true` for suspended blogs.
+         *                                  Set to `false` to force cron to run or `true` to force cron to quit.
+         * @param null|object $current_blog The blog object for which cron will run or null if not in
+         *                                  multi-site.
+         */
+        if ( true === apply_filters( 'skip_cron_for_blog', $should_skip, $current_blog ) ) {
                 return;
+        }
+        unset( $should_skip );
 
         $gmt_time = microtime( true );
         $keys = array_keys( $crons );