curl_multi_init

(PHP 5)

curl_multi_initReturns a new cURL multi handle

Beskrivelse

resource curl_multi_init ( void )

Allows the processing of multiple cURL handles in parallel.

Parametre

This function has no parameters.

Returnerings Værdier

Returns a cURL multi handle resource on success, FALSE on failure.

Eksempler

Eksempel #1 curl_multi_init() example

This example will create two cURL handles, add them to a multi handle, and then run them in parallel.

<?php
// create both cURL resources
$ch1 curl_init();
$ch2 curl_init();

// set URL and other appropriate options
curl_setopt($ch1CURLOPT_URL"http://lxr.php.net/");
curl_setopt($ch1CURLOPT_HEADER0);
curl_setopt($ch2CURLOPT_URL"http://www.php.net/");
curl_setopt($ch2CURLOPT_HEADER0);

//create the multiple cURL handle
$mh curl_multi_init();

//add the two handles
curl_multi_add_handle($mh,$ch1);
curl_multi_add_handle($mh,$ch2);

$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
curl_multi_remove_handle($mh$ch1);
curl_multi_remove_handle($mh$ch2);
curl_multi_close($mh);

?>

Se også

add a note add a note

User Contributed Notes 5 notes

up
46
w_haigh at yahoo dot com
8 years ago
Here's an easier to follow example, From : http://arguments.callee.info/2010/02/21/multiple-curl-requests-with-php/

// build the individual requests, but do not execute them
$ch_1 = curl_init('http://webservice.one.com/');
$ch_2 = curl_init('http://webservice.two.com/');
curl_setopt($ch_1, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch_2, CURLOPT_RETURNTRANSFER, true);
 
// build the multi-curl handle, adding both $ch
$mh = curl_multi_init();
curl_multi_add_handle($mh, $ch_1);
curl_multi_add_handle($mh, $ch_2);
 
// execute all queries simultaneously, and continue when all are complete
  $running = null;
  do {
    curl_multi_exec($mh, $running);
  } while ($running);

//close the handles
curl_multi_remove_handle($mh, $ch1);
curl_multi_remove_handle($mh, $ch2);
curl_multi_close($mh);
 
// all of our requests are done, we can now access the results
$response_1 = curl_multi_getcontent($ch_1);
$response_2 = curl_multi_getcontent($ch_2);
echo "$response_1 $response_2"; // output results
up
44
xxavalanchexx at gmail dot com
9 years ago
According to https://bugs.php.net/bug.php?id=61141:

On Windows setups using libcurl version 7.24 or later (which seems to correspond to PHP 5.3.10 or later), you may find that curl_multi_select() always returns -1, causing the example code in the documentation to timeout. This is, apparently, not strictly a bug: according to the libcurl documentation, you should add your own sleep if curl_multi_select returns -1.

Therefore, in order to work correctly on Windows for PHP 5.3.10+, the second loop in the example code should look something like the following:

<?php
while ($active && $mrc == CURLM_OK) {
    if (
curl_multi_select($mh) == -1) {
       
usleep(100);
    }
    do {
       
$mrc = curl_multi_exec($mh, $active);
    } while (
$mrc == CURLM_CALL_MULTI_PERFORM);
}
?>
up
5
Adam Richardson
6 years ago
One of the URLs used in the first example on this page (lxr.php.net) now gives a proxy error.

If you're using this first script example, replace with a different URL.
up
-13
hushuilong at gmail dot com
12 years ago
Simulate multiple threads request:
<?php
function multiple_threads_request($nodes){
       
$mh = curl_multi_init();
       
$curl_array = array();
        foreach(
$nodes as $i => $url)
        {
           
$curl_array[$i] = curl_init($url);
           
curl_setopt($curl_array[$i], CURLOPT_RETURNTRANSFER, true);
           
curl_multi_add_handle($mh, $curl_array[$i]);
        }
       
$running = NULL;
        do {
           
usleep(10000);
           
curl_multi_exec($mh,$running);
        } while(
$running > 0);
       
       
$res = array();
        foreach(
$nodes as $i => $url)
        {
           
$res[$url] = curl_multi_getcontent($curl_array[$i]);
        }
       
        foreach(
$nodes as $i => $url){
           
curl_multi_remove_handle($mh, $curl_array[$i]);
        }
       
curl_multi_close($mh);       
        return
$res;
}
print_r(muti_thread_request(array(
   
'http://www.example.com',
   
'http://www.example.net',
)));
?>
up
-64
jaisen at jmathai dot com
15 years ago
http://github.com/jmathai/epicode/tree/master/php/EpiCurl.php

If you fire off 10 curl requests in parallel you don't have to wait for all of them to be finished before accessing one which is already finished.
To Top