From 6b76c57303b432a22dc5df51fe5cd6af6f73c79d Mon Sep 17 00:00:00 2001
From: xfra35 <xfra35@gmail.com>
Date: Mon, 21 Dec 2015 12:39:31 +0100
Subject: [PATCH] Better async detection

---
 lib/cron.php | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/lib/cron.php b/lib/cron.php
index ffd2518..b9598dd 100644
--- a/lib/cron.php
+++ b/lib/cron.php
@@ -202,8 +202,10 @@ function __construct() {
         if (isset($config['presets']))
             foreach($config['presets'] as $name=>$expr)
                 $this->preset($name,is_array($expr)?implode(',',$expr):$expr);
-        if (function_exists('exec') && exec('php -r "echo 1+3;"')=='4')
-            $this->async=TRUE;
+        if (function_exists('exec')) {
+            exec('php -v 2>&1',$out,$ret);
+            $this->async=$ret==0;// check if the `php` binary is in the path and can be executed
+        }
         $f3->route(array('GET /cron','GET /cron/@job'),array($this,'route'));
     }