php使用curl设置超时的重要性

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function http_request($URI, $isHearder = false, $post = false)

{

    $ch = curl_init();

    curl_setopt($ch, CURLOPT_URL, $URI);

    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

    curl_setopt($ch, CURLOPT_TIMEOUT, 60);          //单位 秒，也可以使用

#curl_setopt($ch, CURLOPT_NOSIGNAL, 1);     //注意，毫秒超时一定要设置这个

#curl_setopt($ch, CURLOPT_TIMEOUT_MS, 200); //超时毫秒，cURL 7.16.2中被加入。从PHP 5.2.3起可使用

    curl_setopt($ch, CURLOPT_HEADER, $isHearder);

    curl_setopt($ch, CURLOPT_USERAGENT, ‘Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.85 Safari/537.36‘);

    curl_setopt($ch, CURLOPT_COOKIEFILE, dirname(__FILE__)."/tmp.cookie");

    curl_setopt($ch, CURLOPT_COOKIEJAR, dirname(__FILE__)."/tmp.cookie");

    if(strpos($URI, ‘https‘) === 0){

        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);

        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);

    }

    if($post){

        curl_setopt ($ch, CURLOPT_POST, 1);

        curl_setopt ($ch, CURLOPT_POSTFIELDS, $post);

    }

    $result = curl_exec($ch);

    curl_close($ch);

    return $result;