php的curl请求是非常好用的功能，下面简单写个范例：

function curl_get($url)
{
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_USERAGENT, $_SERVER['HTTP_USER_AGENT']);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_TIMEOUT, 30);
    $response = curl_exec($ch);
    $head_info = curl_getinfo($ch);

    if ($head_info['http_code'] != 200){
        return false;
    }

    return $response;
}