PHP 使用 CURL 同步抓取多个网页

<font face="NSimsun"><?php <br/> function async_get_url($url_array, $wait_usec = 0)<br> {<br>     if (!is_array($url_array))<br>         return false;<br> <br>     $wait_usec = intval($wait_usec);<br> <br>     $data    = array();<br>     $handle  = array();<br>     $running = 0;<br> <br>     $mh = curl_multi_init(); // multi curl handler<br> <br>     $i = 0;<br>     foreach($url_array as $url) {<br>         $ch = curl_init();<br> <br>         curl_setopt($ch, CURLOPT_URL, $url);<br>         curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); // return don't print<br>         curl_setopt($ch, CURLOPT_TIMEOUT, 30);<br>         curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)');<br>         curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1); // 302 redirect<br>         curl_setopt($ch, CURLOPT_MAXREDIRS, 7);<br> <br>         curl_multi_add_handle($mh, $ch); // 把 curl resource 放进 multi curl handler 里<br> <br>         $handle[$i++] = $ch;<br>     }<br> <br>     /* 执行 */<br>     do {<br>         curl_multi_exec($mh, $running);<br> <br>         if ($wait_usec > 0) /* 每个 connect 要间隔多久 */<br>             usleep($wait_usec); // 250000 = 0.25 sec<br>     } while ($running > 0);<br> <br>     /* 读取资料 */<br>     foreach($handle as $i => $ch) {<br>         $content  = curl_multi_getcontent($ch);<br>         $data[$i] = (curl_errno($ch) == 0) ? $content : false;<br>     }<br> <br>     /* 移除 handle*/<br>     foreach($handle as $ch) {<br>         curl_multi_remove_handle($mh, $ch);<br>     }<br> <br>     curl_multi_close($mh);<br> <br>     return $data;<br> }<br> ?> </font>