curl_setopt工作正常，在瀏覽器，但不是在cron標籤

Question

cron命令 - wget的--spider 'URL'

PHP文件 -

function getHTML($url,$timeout) 
{ 

$ch = curl_init($url); // initialize curl with given url 

     curl_setopt($ch, CURLOPT_USERAGENT, $_SERVER["HTTP_USER_AGENT"]); //set useragent 

     curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); // write the response to a variable 

     curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true); // follow redirects if any 

     curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout); // max. seconds to execute 

     curl_setopt($ch, CURLOPT_FAILONERROR, 1); // stop when it encounters an error 

     return @curl_exec($ch); 

} 

無差錯 遠程文件是否存在，並可能包含進一步的聯繫，但遞歸被禁用 - 不檢索。

沒有得到我錯誤的地方。

Answer 1

問題是您在第6行引用'$_SERVER["HTTP_USER_AGENT"]'，但是從crontab執行時，$ _SERVER ['HTTP_USER_AGENT']未定義。使用isset()來檢查數組項是否存在。

---

<?php 
function getHTML($url,$timeout) 
{ 

     $ch = curl_init($url); // initialize curl with given url 

     curl_setopt($ch, CURLOPT_USERAGENT, (isset($_SERVER["HTTP_USER_AGENT"]) ? $_SERVER["HTTP_USER_AGENT"] : "PHP/5.5")); //set useragent 

     curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); // write the response to a variable 

     curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true); // follow redirects if any 

     curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout); // max. seconds to execute 

     curl_setopt($ch, CURLOPT_FAILONERROR, 1); // stop when it encounters an error 

     return @curl_exec($ch); 

}