php 中curl 循环去请求多个URL和多线程去请求多个URL的方法

第一种：循环请求

$sr=array(url_1,url_2,url_3);
foreach ($sr as $k=>$v) {
$curlPost=$v.'?f=传入参数';
$ch = curl_init($curlPost) ;
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true) ; // 获取数据返回
curl_setopt($ch, CURLOPT_BINARYTRANSFER, true) ; // 在启用 CURLOPT_RETURNTRANSFER 时候将获取数据返回
$data = curl_exec($ch) ;
echo $k.'##:'.$data.'<br>';

}

curl_close($ch);

$mh = curl_multi_init();
foreach ($sr as $i => $url) {
$curlPost=$url.'?f=%2Fpipefile%2Fskincss%2Fskincss_1356490012_1.zip%40%2Fskincss%2Fimages%2Fskincss_1356490012_1.jpg';
$conn[$i]=curl_init($curlPost);
curl_setopt($conn[$i],CURLOPT_RETURNTRANSFER,1);
curl_multi_add_handle ($mh,$conn[$i]);
}
do {
$mrc = curl_multi_exec($mh,$active);
} while ($mrc == CURLM_CALL_MULTI_PERFORM);
while ($active and $mrc == CURLM_OK) {
if (curl_multi_select($mh) != -1) {
do {
$mrc = curl_multi_exec($mh, $active);
} while ($mrc == CURLM_CALL_MULTI_PERFORM);
}
}
foreach ($sr as $i => $url) {
$res[$i]=curl_multi_getcontent($conn[$i]);
curl_close($conn[$i]);
}
var_dump($res);