curl_multi_init
(PHP 5, PHP 7)
curl_multi_init — 返回一个新cURL批处理句柄
说明
允许并行地处理批处理cURL句柄。
参数
此函数没有参数。
返回值
成功时返回一个cURL批处理句柄，失败时返回 FALSE 。
范例
Example #1 curl_multi_init() example
这个范例将会创建2个cURL句柄，把它们加到批处理句柄，然后并行地运行它们。
<?php
// 创建一对cURL资源
$ch1 = curl_init ();
$ch2 = curl_init ();
// 设置URL和相应的选项
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 );
// 创建批处理cURL句柄
$mh = curl_multi_init ();
// 增加2个句柄
curl_multi_add_handle ( $mh , $ch1 );
curl_multi_add_handle ( $mh , $ch2 );
$running = null ;
// 执行批处理句柄
do {
usleep ( 10000 );
curl_multi_exec ( $mh , $running );
} while ( $running > 0 );
// 关闭全部句柄
curl_multi_remove_handle ( $mh , $ch1 );
curl_multi_remove_handle ( $mh , $ch2 );
curl_multi_close ( $mh );
?> 参见
- curl_init() - 初始化一个cURL会话
- curl_multi_close() - 关闭一组cURL句柄
用户评论:
[#1] w_haigh at yahoo dot com [2015-10-13 15:46:09]
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 $response_2"; // output results
[#2] xxavalanchexx at gmail dot com [2014-05-20 00:17:23]
According to https://bugs.php.net/bug.php?id=61141:
On Windows setups using libcurl version 7.24 or later (which seems to correspond to PHP 5.3.10 or later), you may find that curl_multi_select() always returns -1, causing the example code in the documentation to timeout. This is, apparently, not strictly a bug: according to the libcurl documentation, you should add your own sleep if curl_multi_select returns -1.
Therefore, in order to work correctly on Windows for PHP 5.3.10+, the second loop in the example code should look something like the following:
<?php
while ($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);
}
?>
[#3] hushuilong at gmail dot com [2011-08-05 00:21:31]
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',
)));
?>
[#4] jaisen at jmathai dot com [2008-05-30 00:09:12]
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.