curl_multi_close
http://curl.haxx.se/libcurl/c/libcurl-multi.html
"When you've added the handles you have for the moment (you can still add new ones at any time), you start the transfers by call curl_multi_perform(3).
curl_multi_perform(3) is asynchronous. It will only execute as little as possible and then return back control to your program. It is designed to never block. If it returns CURLM_CALL_MULTI_PERFORM you better call it again soon, as that is a signal that it still has local data to send or remote data to receive."
So it seems the loop in sample script should look this way:
<?php
$running=null;
//execute the handles
do {
while (CURLM_CALL_MULTI_PERFORM === curl_multi_exec($mh, $running));
if (!$running) break;
while (($res = curl_multi_select($mh)) === 0) {};
if ($res === false) {
echo "<h1>select error</h1>";
break;
}
} while (true);
?>
This worked fine (PHP 5.2.5 @ FBSD 6.2) without running non-blocked loop and wasting CPU time.
However this seems to be the only use of curl_multi_select, coz there's no simple way to bind it with other PHP wrappers for select syscall.
curl_multi_exec
(PHP 5)
curl_multi_exec — Führt die Unter-Verbindungen des cURL-Handles aus
Beschreibung
int curl_multi_exec
( resource $mh
, int &$still_running
)
Verarbeitet alle Handles; diese Methode kann unabhängig davon aufgerufen werden, ob eines der Handles Daten lesen oder schreiben muß.
Parameter-Liste
- mh
-
Ein von curl_multi_init() zurückgegebenes cURL-Multihandle.
- still_running
-
Eine Referenz auf ein Flag um festzustellen, ob auf einem oder mehreren Handles noch gearbeitet wird.
Rückgabewerte
Ein cURL-Code der in den cURL Vordefinierten Konstanten definiert ist.
Hinweis: Es werden nur Fehler zurückgegeben, die den Handle-Stack betreffen. Auch wenn CURLM_OK zurückgegeben wird können auf einzelnen Handles Fehler aufgetreten sein.
Beispiele
Beispiel #1 curl_multi_exec() Besipiel
In diesem Beispiel werden zwei cURL-Handles erstellt, einem Mehrfach-Handle hinzugefügt und anschliessend parallel ausgeführt.
<?php
// zwei cURL Resourcen erstellen
$ch1 = curl_init();
$ch2 = curl_init();
// URL und weitere Optionen setzen
curl_setopt($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);
// Mehrfach-Handle erstellen
$mh = curl_multi_init();
// die zuvor erstellten Handles hinzufügen
curl_multi_add_handle($mh,$ch1);
curl_multi_add_handle($mh,$ch2);
$active = null;
// Handles ausführen
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);
?>
add a note
User Contributed Notescurl_multi_exec
viczbk.ru
08-Feb-2008 08:04
08-Feb-2008 08:04
robert dot reichel at boboton dot com
20-Oct-2007 05:54
20-Oct-2007 05:54
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
shichuanr at gmail dot com
06-Sep-2007 05:12
06-Sep-2007 05:12
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);
?>
substr("iscampifriese",1,11) dot " at beer dot com"
04-Jul-2007 06:10
04-Jul-2007 06:10
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.