PHP 5.4.33 Released

curl_multi_init

(PHP 5)

curl_multi_init返回一个新cURL批处理句柄

说明

resource curl_multi_init ( void )

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($ch1CURLOPT_URL"http://www.example.com/");
curl_setopt($ch1CURLOPT_HEADER0);
curl_setopt($ch2CURLOPT_URL"http://www.php.net/");
curl_setopt($ch2CURLOPT_HEADER0);

// 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

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User Contributed Notes 3 notes

up
1
xxavalanchexx at gmail dot com
3 months 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 (
$mrc == CURLM_CALL_MULTI_PERFORM);
}
?>
up
-5
hushuilong at gmail dot com
3 years ago
Simulate multiple threads request:
<?php
function multiple_threads_request($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',
)));
?>
up
-13
jaisen at jmathai dot com
6 years ago
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.
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