Delete transients when activating cache

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Changelog
 
+## Unreleased
+
+- Delete transients when cache is enabled
+
 ## 2.7.0
 
 - Preserve key TTL when calling (in|de)crement methods

includes/class-plugin.php

@@ -119,6 +119,8 @@
 
         add_action( 'wp_head', [ $this, 'register_shutdown_hooks' ] );
 
+        add_action( 'redis_object_cache_enable', [ $this, 'maybe_delete_transients' ] );
+
         add_filter( 'qm/collectors', [ $this, 'register_qm_collector' ], 25 );
         add_filter( 'qm/outputter/html', [ $this, 'register_qm_output' ] );
 
@@ -1204,6 +1206,33 @@
         }
     }
 
+    /**
+     * Delete all transients if the cache was enabled successfully.
+     * Callback for `redis_object_cache_enable` action.
+     *
+     * @param bool $should_delete
+     * @return void
+     */
+    public function maybe_delete_transients( $should_delete ) {
+        global $wpdb;
+
+        if ( ! $result ) {
+            return;
+        }
+
+        $wpdb->query( $wpdb->prepare(
+            "DELETE FROM {$wpdb->options} WHERE option_name LIKE %s OR option_name LIKE %s",
+            '_transient_%',
+            '_site_transient_%'
+        ) );
+
+        if ( is_multisite() ) {
+            $wpdb->query( $wpdb->prepare(
+                "DELETE FROM {$wpdb->sitemeta} WHERE meta_key LIKE %s", '_site_transient_%'
+            ) );
+        }
+    }
+
     /**
      * Displays the redis cache html comment
      *

includes/cli/class-commands.php

@@ -77,6 +77,14 @@ public function enable() {
                 FS_CHMOD_FILE
             );
 
+            /**
+             * Fires on cache enable event
+             *
+             * @since 1.3.5
+             * @param bool $result Whether the filesystem event (copy of the `object-cache.php` file) was successful.
+             */
+            do_action( 'redis_object_cache_enable', $copy );
+
             if ( $copy ) {
                 WP_CLI::success( __( 'Object cache enabled.', 'redis-cache' ) );
             } else {