php使用curl多线程提交

<?php include "log.php";
 $stime=microtime(true); 
$urls = array(
   "http://localhost/index.php",
   "http://localhost/index.php",
   "http://localhost/index.php",
   "http://localhost/index.php",
    "http://localhost/index.php",
   "http://localhost/index.php",
   "http://localhost/index.php",
);

$mh = curl_multi_init();

foreach ($urls as $i => $url) {
    $conn[$i] = curl_init($url);
    curl_setopt($conn[$i], CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($conn[$i], CURLOPT_POST, 1);
    curl_setopt($conn[$i], CURLOPT_POSTFIELDS, array('offset'=>$i)); //提交数据
    curl_multi_add_handle($mh, $conn[$i]);
}

do {
    $status = curl_multi_exec($mh, $active);
    $info = curl_multi_info_read($mh);
    if (false !== $info) {
        //var_dump($info);
    }
} while ($status === CURLM_CALL_MULTI_PERFORM || $active);

foreach ($urls as $i => $url) {
    $res[$i] = curl_multi_getcontent($conn[$i]); //获取返回内容
    curl_close($conn[$i]);
}
echo "<pre class="brush:php;toolbar:false">";
print_r($res);
$etime=microtime(true);//获取程序执行结束的时间    
$total=$etime-$stime;   //计算差值     
$str_total = var_export($total, TRUE);
echo $str_total;