From 5b85a81bb178311b5b23ec526a18aadcf9b0e9e1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Till=20Kr=C3=BCss?= <tillkruss@users.noreply.github.com>
Date: Mon, 6 Oct 2025 09:21:47 -0700
Subject: [PATCH 1/4] delete transients

---
 CHANGELOG.md                    |  4 ++++
 includes/class-plugin.php       | 26 ++++++++++++++++++++++++++
 includes/cli/class-commands.php |  8 ++++++++
 3 files changed, 38 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index b6643efa..b4d45f59 100644
--- a/CHANGELOG.md
+++ b/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
diff --git a/includes/class-plugin.php b/includes/class-plugin.php
index 213f53ef..edc0bde4 100644
--- a/includes/class-plugin.php
+++ b/includes/class-plugin.php
@@ -119,6 +119,8 @@ public function add_actions_and_filters() {
 
         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 +1206,30 @@ public function register_shutdown_hooks() {
         }
     }
 
+    /**
+     * Registers all hooks associated with the shutdown hook
+     *
+     * @param bool $result
+     * @return void
+     */
+    public function maybe_delete_transients( $result ) {
+        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
      *
diff --git a/includes/cli/class-commands.php b/includes/cli/class-commands.php
index 9957f851..13d1e42b 100644
--- a/includes/cli/class-commands.php
+++ b/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', $result );
+
             if ( $copy ) {
                 WP_CLI::success( __( 'Object cache enabled.', 'redis-cache' ) );
             } else {

From f90beae75d68298cb0ca019a050c8960dd149529 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Till=20Kr=C3=BCss?= <tillkruss@users.noreply.github.com>
Date: Mon, 6 Oct 2025 09:23:32 -0700
Subject: [PATCH 2/4] fix var name

---
 includes/cli/class-commands.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/includes/cli/class-commands.php b/includes/cli/class-commands.php
index 13d1e42b..8503c228 100644
--- a/includes/cli/class-commands.php
+++ b/includes/cli/class-commands.php
@@ -83,7 +83,7 @@ public function enable() {
              * @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', $result );
+            do_action( 'redis_object_cache_enable', $copy );
 
             if ( $copy ) {
                 WP_CLI::success( __( 'Object cache enabled.', 'redis-cache' ) );

From 07a76890c2247e658a9fcfd8508d85edf7af2252 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Till=20Kr=C3=BCss?= <tillkruss@users.noreply.github.com>
Date: Mon, 6 Oct 2025 09:25:41 -0700
Subject: [PATCH 3/4] update comment

---
 includes/class-plugin.php | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/includes/class-plugin.php b/includes/class-plugin.php
index edc0bde4..f2ffd039 100644
--- a/includes/class-plugin.php
+++ b/includes/class-plugin.php
@@ -1207,7 +1207,8 @@ public function register_shutdown_hooks() {
     }
 
     /**
-     * Registers all hooks associated with the shutdown hook
+     * Delete all transients if the cache was enabled successfully.
+     * Callback for `redis_object_cache_enable` action.
      *
      * @param bool $result
      * @return void
@@ -1215,7 +1216,9 @@ public function register_shutdown_hooks() {
     public function maybe_delete_transients( $result ) {
         global $wpdb;
 
-        if ( ! $result ) { return; }
+        if ( ! $result ) {
+            return;
+        }
 
         $wpdb->query( $wpdb->prepare(
             "DELETE FROM {$wpdb->options} WHERE option_name LIKE %s OR option_name LIKE %s",

From aee6e97a2b1c785fe775821219586f941b952aee Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Till=20Kr=C3=BCss?= <tillkruss@users.noreply.github.com>
Date: Mon, 6 Oct 2025 11:58:06 -0700
Subject: [PATCH 4/4] Rename parameter in maybe_delete_transients method

Update parameter name in maybe_delete_transients method.
---
 includes/class-plugin.php | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/includes/class-plugin.php b/includes/class-plugin.php
index f2ffd039..141ef18b 100644
--- a/includes/class-plugin.php
+++ b/includes/class-plugin.php
@@ -1210,10 +1210,10 @@ public function register_shutdown_hooks() {
      * Delete all transients if the cache was enabled successfully.
      * Callback for `redis_object_cache_enable` action.
      *
-     * @param bool $result
+     * @param bool $should_delete
      * @return void
      */
-    public function maybe_delete_transients( $result ) {
+    public function maybe_delete_transients( $should_delete ) {
         global $wpdb;
 
         if ( ! $result ) {