PHP 使用 CURL 同步抓取多个网页

<?php
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(); // multi curl handler

    $i=0;
    foreach($url_array as $url) {
        $ch=curl_init();

        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); // return don't print
        curl_setopt($ch, CURLOPT_TIMEOUT, 30);
        curl_setopt($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);

        curl_multi_add_handle($mh, $ch); // 把 curl resource 放进 multi curl handler 里

        $handle[$i++]=$ch;
    }

   
    do {
        curl_multi_exec($mh, $running);

        if ($wait_usec > 0)
            usleep($wait_usec); // 250000=0.25 sec
    } while ($running > 0);

   
    foreach($handle as $i=> $ch) {
        $content =curl_multi_getcontent($ch);
        $data[$i]=(curl_errno($ch)==0) ? $content : false;
    }

   
    foreach($handle as $ch) {
        curl_multi_remove_handle($mh, $ch);
    }

    curl_multi_close($mh);

    return $data;
}
?>