PHP : Function Reference : CURL, Client URL Library Functions : curl_multi

Example 434. curl_multi_exec() 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($ch1, CURLOPT_URL, "http://www.example.com/");
curl_setopt($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);

$running=null;
//execute the handles
do {

    $mrc = curl_multi_exec($mh, $running);

} 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);

?>

Code Examples / Notes » curl_multi_exec

If you are using mulit handles and you wish to re-execute any of them (if they timed out or something), then you need to remove the handles from the mulit-handle and then re-add them in order to get them to re-execute. Otherwise cURL will just give you back the same results again without actually retrying.

I was testing PHP code provided by dtorop933@gmail.com in curl_multi_exec section of PHP Manual. The part of the code '$err = curl_error($conn[$i])' should return error message for each cURL session, but it does not. The function curl_error() works well with the curl_exec(). Is there any other solution for getting session error message with curl_multi_exec() or there is a bug in cURL library. The script was tested with Windows XP and PHP-5.2.4

For people who have problem running the above example script(Example 425. curl_multi_exec()), you can alter it a little bit to make it work properly by replacing the existing chunk of code with the one below: <?php // create both cURL resources $ch1 = curl_init(); $ch2 = curl_init(); // set URL and other appropriate options curl_setopt($ch1, CURLOPT_URL, "http://www.google.com/"); 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); $running=null; //execute the handles do { curl_multi_exec($mh,$running); } while ($running > 0); //close the handles curl_multi_remove_handle($mh,$ch1); curl_multi_remove_handle($mh,$ch1); curl_multi_close($mh); ?>

<?php $connomains = array( "http://www.cnn.com/", "http://www.canada.com/", "http://www.yahoo.com/" ); $mh = curl_multi_init(); foreach ($connomains as $i => $url) { $conn[$i] = curl_init($url); curl_setopt($conn[$i], CURLOPT_RETURNTRANSFER, 1); curl_multi_add_handle ($mh,$conn[$i]); } // start performing the request do { $mrc = curl_multi_exec($mh, $active); } while ($mrc == CURLM_CALL_MULTI_PERFORM); while ($active and $mrc == CURLM_OK) { // wait for network if (curl_multi_select($mh) != -1) { // pull in any new data, or at least handle timeouts do { $mrc = curl_multi_exec($mh, $active); } while ($mrc == CURLM_CALL_MULTI_PERFORM); } } if ($mrc != CURLM_OK) { print "Curl multi read error $mrc\n"; } // retrieve data foreach ($connomains as $i => $url) { if (($err = curl_error($conn[$i])) == '') { $res[$i]=curl_multi_getcontent($conn[$i]); } else { print "Curl error on handle $i: $err\n"; } curl_multi_remove_handle($mh,$conn[$i]); curl_close($conn[$i]); } curl_multi_close($mh); print_r($res); ?>

curl_multi_exec

Run the sub-connections of the current cURL handle (PHP 5)
int curl_multi_exec ( resource mh, int &still_running )

Example 434. curl_multi_exec() example

Code Examples / Notes » curl_multi_exec

Change Language

curl_multi_exec

Run the sub-connections of the current cURL handle (PHP 5) int curl_multi_exec ( resource mh, int &still_running )

Example 434. curl_multi_exec() example

Code Examples / Notes » curl_multi_exec

Change Language

Run the sub-connections of the current cURL handle (PHP 5)
int curl_multi_exec ( resource mh, int &still_running )