CURLOPT php错误的原因和可解决办法

如果当你在php中运行 CURLOPT_FOLLOWLOCATION 然后得到php提示错误信息为:
Warning: curl_setopt() [function.curl-setopt]: CURLOPT_FOLLOWLOCATION cannot be activated when in safe_mode or an open_basedir is set...

错误中提到两个关键safe_mode和 open_basedir,如果你是虚拟主机的没有设置APPCHE的权限是不能通过修改服务器配置来解决问题的,一般来说,服务器配置safe_mode都为off,然后为了一些安全对用户有一些限制,通过设置open_basedir来限制虚拟主机用户的PHP执行文件夹,因此当你使用CURLOPT_FOLLOWLOCATION (php curl函数,深层抓取数据)的时候,一旦有301转向等就会出现文中提到的错误信息.

在查了相关资料后,很快找到了解决办法,http://www.php.net/manual/en/function.curl-setopt.php,这些方法都在php官方帮助里有.

具体做法是在curl语句用不使用curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true),在php函数中自定义一个函数,

function curl_redir_exec($ch,$debug="") 
{ 
    static $curl_loops = 0; 
    static $curl_max_loops = 20; 

    if ($curl_loops++ >= $curl_max_loops) 
    { 
        $curl_loops = 0; 
        return FALSE; 
    } 
    curl_setopt($ch, CURLOPT_HEADER, true); 
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); 
    $data = curl_exec($ch); 
    $debbbb = $data; 
    list($header, $data) = explode("\n\n", $data, 2); 
    $http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE); 

    if ($http_code == 301 || $http_code == 302) { 
        $matches = array(); 
        preg_match('/Location:(.*?)\n/', $header, $matches); 
        $url = @parse_url(trim(array_pop($matches))); 
        //print_r($url); 
        if (!$url) 
        { 
            //couldn't process the url to redirect to 
            $curl_loops = 0; 
            return $data; 
        } 
        $last_url = parse_url(curl_getinfo($ch, CURLINFO_EFFECTIVE_URL)); 
    /*    if (!$url['scheme']) 
            $url['scheme'] = $last_url['scheme']; 
        if (!$url['host']) 
            $url['host'] = $last_url['host']; 
        if (!$url['path']) 
            $url['path'] = $last_url['path'];*/ 
        $new_url = $url['scheme'] . '://' . $url['host'] . $url['path'] . ($url['query']?'?'.$url['query']:''); 
        curl_setopt($ch, CURLOPT_URL, $new_url); 
    //    debug('Redirecting to', $new_url); 

        return curl_redir_exec($ch); 
    } else { 
        $curl_loops=0; 
        return $debbbb; 
    } 
} 

函数定义好后,curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true)这条语句替换为curl_redir_exec($ch)

这样以后,我想你的PHP文件应该不会提示错误了,关于这段代码,在提供PHP官方连接用可以找到.