Curl Multi Threading - php

Question

i am finding a Curl function which can open particular no. of webpage open at a time also there will no output or returndata false will more good . I need to access 5-10 url at a same time .. I heard abt Curl Multi Threading but dont have proper function or class to use it ..
i find some by searching but most of them seems to be loop mean it i not using continuous connection just one after one ! I want something which can connect multiple connection at a time not one by one !
I made one :
function mutload($url){
if(!is_array($url)){
exit;
}
for($i=0;$i<count($url);$i++){
// create both cURL resources
$ch[] = curl_init();
$ch[] = curl_init();
// set URL and other appropriate options
curl_setopt($ch[$i], CURLOPT_URL, $url[$i]);
curl_setopt($ch[$i], CURLOPT_HEADER, 0);
curl_setopt($ch[$i], CURLOPT_RETURNTRANSFER, 0);
}
//create the multiple cURL handle
$mh = curl_multi_init();
for($i=0;$i<count($url);$i++){
//add the two handles
curl_multi_add_handle($mh,$ch[$i]);
}
$active = null;
//execute the handles
do {
$mrc = curl_multi_exec($mh, $active);
} while ($mrc == CURLM_CALL_MULTI_PERFORM);
while ($active && $mrc == CURLM_OK) {
if (curl_multi_select($mh) != -1) {
do {
$mrc = curl_multi_exec($mh, $active);
} while ($mrc == CURLM_CALL_MULTI_PERFORM);
}
}
//close the handles
for($i=0;$i<count($url);$i++){
curl_multi_remove_handle($mh, $ch[$i]);
}
curl_multi_close($mh);
}
ok ! but i m confused that will it connect all the urls at a time or one by one ! mre over i am geeting the content also i only want to connect or request to the site do not need ay content from there i used RETURNTRASFER,false but didnt work .. please hlep me thanks !

Answer 1

You're looking for the curl_multi_* family of functions. Have a look at curl_multi_exec.
Set CURLOPT_NOBODY to prevent curl from downloading any cotent.

Answer 2

I didn't test your code but curl_multi adds items to a queue from a loop and process them in parallel. Sometimes there can be issues if you are trying to load 100s of URLs, but it should be fine for a few URLs. If you have long DNS lookups or slow servers, all your results will have to wait for the slowest request.
This code is tested and should work, it is somewhat similar to yours:
http://www.onlineaspect.com/2009/01/26/how-to-use-curl_multi-without-blocking/