curl_multi_init 模拟并发请求

error_reporting(0);
// 创建批处理cURL句柄
for($i=0;$i<100;$i++){
$arr[] = 'http://xxxx';
}

$mh = curl_multi_init();
foreach($arr as $k=>$v){

$ch = 'ch'.$k;
$ch= curl_init();
curl_setopt($ch, CURLOPT_URL, $v);
curl_multi_add_handle($mh,$ch);
}

$running=null;
// 执行批处理句柄
do {
usleep(10000);
curl_multi_exec($mh,$running);
} while ($running > 0);

foreach($arr as $k1=>$v1){
// 关闭全部句柄
$mm = 'ch'.$k1;
curl_multi_remove_handle($mh,$mm);
}
curl_multi_close($mh);