Add OPcache restart hook

Author: realFlowControl

ext/opcache/ZendAccelerator.c

@@ -3410,6 +3410,8 @@ void accel_shutdown(void)
 	}
 }
 
+ZEND_EXT_API void (*zend_accel_schedule_restart_hook)(zend_accel_restart_reason reason);
+
 void zend_accel_schedule_restart(zend_accel_restart_reason reason)
 {
 	const char *zend_accel_restart_reason_text[ACCEL_RESTART_USER + 1] = {
@@ -3418,6 +3420,10 @@ void zend_accel_schedule_restart(zend_accel_restart_reason reason)
 		"user",
 	};
 
+	if (zend_accel_schedule_restart_hook) {
+		zend_accel_schedule_restart_hook(reason);
+	}
+
 	if (ZCSG(restart_pending)) {
 		/* don't schedule twice */
 		return;

ext/opcache/ZendAccelerator.h

@@ -311,8 +311,9 @@ extern const char *zps_api_failure_reason;
 BEGIN_EXTERN_C()
 
 void accel_shutdown(void);
-zend_result  accel_activate(INIT_FUNC_ARGS);
+zend_result accel_activate(INIT_FUNC_ARGS);
 zend_result accel_post_deactivate(void);
+extern ZEND_EXT_API void (*zend_accel_schedule_restart_hook)(zend_accel_restart_reason reason);
 void zend_accel_schedule_restart(zend_accel_restart_reason reason);
 void zend_accel_schedule_restart_if_necessary(zend_accel_restart_reason reason);
 accel_time_t zend_get_file_handle_timestamp(zend_file_handle *file_handle, size_t *size);