php 中curl 循环往请求多个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.'
';}
curl_close($ch);

$sr=array(url_1,url_2,url_3);
$mh = curl_multi_init();     
foreach ($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);