PHP 8.3.4 Released!

curl_multi_init

(PHP 5, PHP 7, PHP 8)

curl_multi_initReturns a new cURL multi handle

Description

curl_multi_init(): CurlMultiHandle

Allows the processing of multiple cURL handles asynchronously.

Parameters

This function has no parameters.

Return Values

Returns a cURL multi handle.

Changelog

Version Description
8.0.0 On success, this function returns a CurlMultiHandle instance now; previously, a resource was returned.

Examples

Example #1 curl_multi_init() example

This example will create two cURL handles, add them to a multi handle, and process them asynchronously.

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

// set URL and other appropriate options
curl_setopt($ch1, CURLOPT_URL, "http://lxr.php.net/");
curl_setopt($ch1, CURLOPT_HEADER, 0);
curl_setopt($ch2, CURLOPT_URL, "http://www.php.net/");
curl_setopt($ch2, CURLOPT_HEADER, 0);

//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);

//execute the multi handle
do {
$status = curl_multi_exec($mh, $active);
if (
$active) {
curl_multi_select($mh);
}
} while (
$active && $status == CURLM_OK);

//close the handles
curl_multi_remove_handle($mh, $ch1);
curl_multi_remove_handle($mh, $ch2);
curl_multi_close($mh);

?>

See Also

add a note

User Contributed Notes 4 notes

up
52
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
45
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
4
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
-16
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',
)));
?>
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