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 — 現在の cURL ハンドルから、サブ接続を実行する
説明
int curl_multi_exec
( resource $mh
, int &$still_running
)
スタック内の各ハンドルを処理します。 このメソッドは、ハンドルがデータの読み書きを要するかどうかにかかわらずコール可能です。
返り値
cURL 定義済み定数 で定義された cURL コードを返します。
注意: これは、マルチスタック全体に関するエラーのみを返します。この関数が CURLM_OK を返したとしても、各転送で個別にエラーが発生している可能性があります。
例
例1 curl_multi_exec() の例
この例は、ふたつの cURL ハンドルを作成し、それをマルチハンドルに追加して並列実行します。
<?php
// cURL リソースを作成します
$ch1 = curl_init();
$ch2 = curl_init();
// URL およびその他適切なオプションを設定します。
curl_setopt($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);
// マルチ cURL ハンドルを作成します
$mh = curl_multi_init();
// ふたつのハンドルを追加します
curl_multi_add_handle($mh,$ch1);
curl_multi_add_handle($mh,$ch2);
$active = null;
// ハンドルを実行します
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);
}
}
// ハンドルを閉じます
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
09-Feb-2008 01:04
09-Feb-2008 01:04
robert dot reichel at boboton dot com
20-Oct-2007 09:54
20-Oct-2007 09:54
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 09:12
06-Sep-2007 09:12
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 10:10
04-Jul-2007 10:10
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.