PHP Cron Job not Executing

我正在尝试在我的Linux服务器上设置一个cron作业。

*/1 * * * * root php -f /var/www/html/includes/cron/cron.inc.a.php &> dev/php.log

cron作业要调用的文件从另一个服务器获得心跳响应。

<?php
    $l = new MySQLi();
    $l->connect(blah);
    $q = $l->query("SELECT * FROM `tbl_latency_stats`");
    set_include_path('/var/www/html/includes/');
    include("ping/ping.php");
    $host = '<IP ADDRESS>';
    $ping = new Ping($host);
    $latency = $ping->ping();
    if (!is_bool($latency)){
        if(is_float($latency) || is_string($latency)) {
            if(is_string($latency)){
              $s = split(".", $latency);
              if($s[0] >= 100){
                $response_array['status'] = "success";
                $response_array['state'] = "WARNING"; 
                $response_array['timedate'] = date("Y-m-d H:i:s");
                $response_array['response'] = "High Latency";
                $response_array['ping'] = "$latency";
                $response_array['message'] = "null";
              }else{
                $response_array['status'] = "success";
                $response_array['state'] = "UP"; 
                $response_array['timedate'] = date("Y-m-d H:i:s");
                $response_array['response'] = "LIVE";
                $response_array['ping'] = "$latency";
                $response_array['message'] = "null";
              }
            }elseif(is_float($latency)){
              if($latency >= 100){
                $response_array['status'] = "success";
                $response_array['state'] = "WARNING"; 
                $response_array['timedate'] = date("Y-m-d H:i:s");
                $response_array['response'] = "High Latency";
                $response_array['ping'] = "$latency";
                $response_array['message'] = "null";
              }else{
                $response_array['status'] = "success";
                $response_array['state'] = "UP"; 
                $response_array['timedate'] = date("Y-m-d H:i:s");
                $response_array['response'] = "LIVE";
                $response_array['ping'] = "$latency";       
                $response_array['message'] = "null";    
              }             
            }
        }else{
            $response_array['status'] = "error";
            $response_array['state'] = "UNKONWN"; 
            $response_array['timedate'] = date("Y-m-d H:i:s");
            $response_array['message'] = "Unexpected Response!";
            $response_array['response'] = "$latency";
            $response_array['ping'] = "null";       
        }
    }else {
        $response_array['status'] = "error";
        $response_array['state'] = "DOWN"; 
        $response_array['timedate'] = date("Y-m-d H:i:s");
        $response_array['message'] = "Request Unreachable!";
        $response_array['response'] = "$latency";
        $response_array['ping'] = "null";
    }                       
    $q = $l->query("INSERT INTO  `enigmaStat`.`tbl_latency_stats` (`latency_stat_id` ,`latency_stat_date_time` ,`latency_stat_status` ,`latency_stat_response` ,`latency_stat_latency_value` ,`latency_stat_user_text`)VALUES ('' , '".$response_array['timedate']."' ,  '".$response_array['state']."',  '".$response_array['response']."',  '".$response_array['ping']."',  '".$response_array['message']."')");

?>

但是没有插入。我已经从网站路径手动通过命令行运行文件，如下所示:

php -f /var/www/html/includes/cron/cron.inc.a.php

并插入到数据库中

我是服务器配置等的新手，所以如果这不够详细，我很抱歉，我很乐意添加任何必要的细节来帮助解决问题。

谢谢。

编辑

我试过了:

env -i sh -c 'php -f /var/www/html/includes/cron/cron.inc.a.php'

，它工作并插入到数据库