php代码检查代理ip的有效性

/**
 +-----------------------------------------------------------------------------
 * 检查代理ip信息有效性
 +-----------------------------------------------------------------------------
 * @param string $proxy_ip [117.95.100.126:8998]
 * @param int $times 执行检查次数
 * @return array
 * @author elinx <654753115@qq.com> 2016-07-29
 +-----------------------------------------------------------------------------
 */
function check_proxy_ip_info($proxy_ip=false, $times=10) {
  $header = array(
    // "GET / HTTP/1.1",
    // "HOST: www.baidu.com",
    "accept: application/json",
    "accept-encoding: gzip, deflate",
    "accept-language: en-US,en;q=0.8",
    "content-type: application/json",
    "user-agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.106 Safari/537.36",
  );
  $url = 'http://www.baidu.com/';
  $result['succeed_times'] = 0; //成功次数
  $result['defeat_times'] = 0; //失败次数
  $result['total_spen']  = 0; //总用时
  for ($i=0; $i < $times; $i++) { 
    $s = microtime();
    $curl = curl_init();
    curl_setopt($curl, CURLOPT_URL, $url); //设置传输的url
    curl_setopt($curl, CURLOPT_HTTPHEADER, $header); //发送http报头
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($curl, CURLOPT_ENCODING, 'gzip,deflate'); // 解码压缩文件
    curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false); //不验证证SSL书
    curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false); //不验证SSL证书
 
    if (@$proxy_ip != false) { //使用代理ip
      curl_setopt($curl, CURLOPT_HTTPHEADER, array (
        'Client_Ip: '.mt_rand(0, 255).'.'.mt_rand(0, 255).'.'.mt_rand(0, 255).'.'.mt_rand(0, 255),
      ));
      curl_setopt($curl, CURLOPT_HTTPHEADER, array (
        'X-Forwarded-For: '.mt_rand(0, 255).'.'.mt_rand(0, 255).'.'.mt_rand(0, 255).'.'.mt_rand(0, 255),
      ));
      curl_setopt($curl, CURLOPT_PROXYTYPE, CURLPROXY_HTTP);
      curl_setopt($curl, CURLOPT_PROXY, $proxy_ip);
    }
 
    curl_setopt($curl, CURLOPT_COOKIEFILE, dirname(__FILE__).'/cookie.txt');
    curl_setopt($curl, CURLOPT_COOKIEJAR, dirname(__FILE__).'/cookie.txt');
    curl_setopt($curl, CURLOPT_TIMEOUT, 30); // 设置超时限制防止死循环
    // $response_header = curl_getinfo($curl); // 获取返回response报头
    $content = curl_exec($curl);
    if (strstr($content, '百度一下，你就知道')) {
      $result['list'][$i]['status'] = 1;
      $result['succeed_times'] += 1;
    } else {
      $result['list'][$i]['status'] = 0;
      $result['defeat_times'] += 1;
    }
    $e = microtime();
    $result['total_spen']     += abs($e-$s);
    $result['list'][$i]['spen']  = abs($e-$s);
    $result['list'][$i]['content'] = json_encode($content, true);
    // $result['list'][$i]['response_header'] = $response_header;
  }
  $result['precent'] = (number_format($result['succeed_times']/$times, 4)*100).'%';
  $result['average_spen'] = number_format($result['total_spen']/$times, 4);
  return $result;
}