Fix hard_timeout when zend-max-execution-timers is enabled

Closes phpGH-19786

Author: Appla

NEWS

@@ -5,6 +5,7 @@ PHP                                                                        NEWS
 - Core:
   . Fixed bug GH-19765 (object_properties_load() bypasses readonly property
     checks). (timwolla)
+  . Fixed hard_timeout with --enable-zend-max-execution-timers. (Appla)
 
 - Standard:
   . Fixed bug GH-12265 (Cloning an object breaks serialization recursion).

Zend/zend_execute_API.c

@@ -1531,7 +1531,9 @@ static void zend_set_timeout_ex(zend_long seconds, bool reset_signals) /* {{{ */
 		return;
 	}
 #elif defined(ZEND_MAX_EXECUTION_TIMERS)
-	zend_max_execution_timer_settime(seconds);
+	if (seconds > 0) {
+		zend_max_execution_timer_settime(seconds);
+	}
 
 	if (reset_signals) {
 		sigset_t sigset;
@@ -1618,7 +1620,9 @@ void zend_unset_timeout(void) /* {{{ */
 		tq_timer = NULL;
 	}
 #elif ZEND_MAX_EXECUTION_TIMERS
-	zend_max_execution_timer_settime(0);
+	if (EG(timeout_seconds)) {
+		zend_max_execution_timer_settime(0);
+	}
 #elif defined(HAVE_SETITIMER)
 	if (EG(timeout_seconds)) {
 		struct itimerval no_timeout;