From 5c5a8f4e8e4dfa112e5ea8a7c86272b3980fe3fb Mon Sep 17 00:00:00 2001
From: Mike Jolley <mike.jolley@me.com>
Date: Tue, 5 Sep 2017 11:54:04 +0100
Subject: [PATCH] Helper functions

---
 ...wc-rest-system-status-tools-controller.php | 23 +------------
 includes/wc-core-functions.php                | 33 +++++++++++++++++++
 2 files changed, 34 insertions(+), 22 deletions(-)

diff --git a/includes/api/class-wc-rest-system-status-tools-controller.php b/includes/api/class-wc-rest-system-status-tools-controller.php
index 17b0caef5d1..c84513df048 100644
--- a/includes/api/class-wc-rest-system-status-tools-controller.php
+++ b/includes/api/class-wc-rest-system-status-tools-controller.php
@@ -388,28 +388,7 @@ class WC_REST_System_Status_Tools_Controller extends WC_REST_Controller {
 				$message = __( 'Product transients cleared', 'woocommerce' );
 			break;
 			case 'clear_expired_transients' :
-				/*
-				 * Deletes all expired transients. The multi-table delete syntax is used.
-				 * to delete the transient record from table a, and the corresponding.
-				 * transient_timeout record from table b.
-				 *
-				 * Based on code inside core's upgrade_network() function.
-				 */
-				$sql = "DELETE a, b FROM $wpdb->options a, $wpdb->options b
-					WHERE a.option_name LIKE %s
-					AND a.option_name NOT LIKE %s
-					AND b.option_name = CONCAT( '_transient_timeout_', SUBSTRING( a.option_name, 12 ) )
-					AND b.option_value < %d";
-				$rows = $wpdb->query( $wpdb->prepare( $sql, $wpdb->esc_like( '_transient_' ) . '%', $wpdb->esc_like( '_transient_timeout_' ) . '%', time() ) );
-
-				$sql = "DELETE a, b FROM $wpdb->options a, $wpdb->options b
-					WHERE a.option_name LIKE %s
-					AND a.option_name NOT LIKE %s
-					AND b.option_name = CONCAT( '_site_transient_timeout_', SUBSTRING( a.option_name, 17 ) )
-					AND b.option_value < %d";
-				$rows2 = $wpdb->query( $wpdb->prepare( $sql, $wpdb->esc_like( '_site_transient_' ) . '%', $wpdb->esc_like( '_site_transient_timeout_' ) . '%', time() ) );
-
-				$message = sprintf( __( '%d transients rows cleared', 'woocommerce' ), $rows + $rows2 );
+				$message = sprintf( __( '%d transients rows cleared', 'woocommerce' ), wc_delete_expired_transients() );
 			break;
 			case 'delete_orphaned_variations' :
 				/**
diff --git a/includes/wc-core-functions.php b/includes/wc-core-functions.php
index 11b26a06acc..899d55313d5 100644
--- a/includes/wc-core-functions.php
+++ b/includes/wc-core-functions.php
@@ -1822,3 +1822,36 @@ function wc_prevent_dangerous_auto_updates( $should_update, $plugin ) {
 	return $should_update;
 }
 add_filter( 'auto_update_plugin', 'wc_prevent_dangerous_auto_updates', 99, 2 );
+
+/**
+ * Delete expired transients.
+ *
+ * Deletes all expired transients. The multi-table delete syntax is used.
+ * to delete the transient record from table a, and the corresponding.
+ * transient_timeout record from table b.
+ *
+ * Based on code inside core's upgrade_network() function.
+ *
+ * @since 3.2.0
+ * @return int Number of transients that were cleared.
+ */
+function wc_delete_expired_transients() {
+	global $wpdb;
+
+	$sql = "DELETE a, b FROM $wpdb->options a, $wpdb->options b
+		WHERE a.option_name LIKE %s
+		AND a.option_name NOT LIKE %s
+		AND b.option_name = CONCAT( '_transient_timeout_', SUBSTRING( a.option_name, 12 ) )
+		AND b.option_value < %d";
+	$rows = $wpdb->query( $wpdb->prepare( $sql, $wpdb->esc_like( '_transient_' ) . '%', $wpdb->esc_like( '_transient_timeout_' ) . '%', time() ) );
+
+	$sql = "DELETE a, b FROM $wpdb->options a, $wpdb->options b
+		WHERE a.option_name LIKE %s
+		AND a.option_name NOT LIKE %s
+		AND b.option_name = CONCAT( '_site_transient_timeout_', SUBSTRING( a.option_name, 17 ) )
+		AND b.option_value < %d";
+	$rows2 = $wpdb->query( $wpdb->prepare( $sql, $wpdb->esc_like( '_site_transient_' ) . '%', $wpdb->esc_like( '_site_transient_timeout_' ) . '%', time() ) );
+
+	return absint( $rows + $rows2 );
+}
+add_action( 'woocommerce_installed', 'wc_delete_expired_transients' );