curl效率及稳定性

function curl_get_contents($url)   
{   
    $ch = curl_init();   
    curl_setopt($ch, CURLOPT_URL, $url);            //设置访问的url地址   
    //curl_setopt($ch,CURLOPT_HEADER,1);            //是否显示头部信息   
    curl_setopt($ch, CURLOPT_TIMEOUT, 5);           //设置超时   
    curl_setopt($ch, CURLOPT_USERAGENT, _USERAGENT_);   //用户访问代理 User-Agent   
    curl_setopt($ch, CURLOPT_REFERER,_REFERER_);        //设置 referer   
    curl_setopt($ch,CURLOPT_FOLLOWLOCATION,1);      //跟踪301   
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);        //返回结果   
    $r = curl_exec($ch);   
    curl_close($ch);   
    return $r;   
}  

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