php使用curl代理实现抓取数据的方法

<?phpdefine ( 'IS_PROXY', true ); //是否启用代理function async_get_url($url_array, $wait_usec = 0){  if (!is_array($url_array))    return false;  $wait_usec = intval($wait_usec);  $data  = array();  $handle = array();  $running = 0;  $mh = curl_multi_init(); // 开启多线程  $i = 0;  foreach($url_array as $url) {    $ch = curl_init();    if (IS_PROXY) {    //以下代码设置代理服务器    //代理服务器地址http://www.cnproxy.com/proxy1.html !!Hong Kong, China的速度比较好    curl_setopt ($ch, CURLOPT_PROXY,'110.4.12.170:80' );    }    curl_setopt($ch, CURLOPT_URL, $url);    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); // return don't print    curl_setopt($ch, CURLOPT_TIMEOUT, 30); //设置超时时间    curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)');    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1); // 302 redirect    curl_setopt($ch, CURLOPT_MAXREDIRS, 7); //HTTp定向级别    curl_multi_add_handle($mh, $ch); // 把 curl resource 放进 multi curl handler 里    $handle[$i++] = $ch;  }  /* 执行 */  do {    $mrc = curl_multi_exec($mh, $running);    if ($wait_usec > 0) /* 每个 connect 要间隔多久 */      usleep($wait_usec); // 250000 = 0.25 sec  } while ($mrc == CURLM_CALL_MULTI_PERFORM);  while ($running && $mrc == CURLM_OK) {    if (curl_multi_select($mh) != -1) {      do {        $mrc = curl_multi_exec($mh, $running);      } while ($mrc == CURLM_CALL_MULTI_PERFORM);    }  }  /* 读取资料 */  foreach($handle as $i => $ch) {    $content = curl_multi_getcontent($ch);    $data[$i] = (curl_errno($ch) == 0) ? $content : false;  }  /* 移除 handle*/  foreach($handle as $ch) {    curl_multi_remove_handle($mh, $ch);  }  curl_multi_close($mh);  return $data;}$urls = array('http://map.baidu.com');$re = async_get_url($urls);echo $re[0];?>