Detailed explanation of the definition and usage of PHP curl_multi_exec function

This article explains the definition and usage examples of the PHP curl_multi_exec function. The meaning of the curl_multi_exec function is to run the sub-connection of the current cURL handle. Let’s look at its description and usage examples in detail.

curl_multi_exec function description

int curl_multi_exec (resource $mh, int &$still_running)

Process each handle in the stack . This method can be called whether the handle needs to read or write data.

curl_multi_exec function parameters

mh

The cURL multiple handles returned by curl_multi_init().

still_running

A reference to an identifier used to determine whether the operation is still being executed.

curl_multi_exec function return value

A cURL code defined in cURL predefined constants.

Note: This function only returns errors related to the entire batch stack. There may still be problems with individual transfers even when CURLM_OK is returned.

curl_multi_exec function example

This example will create 2 cURL handles, add them to the batch handle, and then run them in parallel.

<?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($ch1, CURLOPT_URL, "http://lxr.php.net/");
curl_setopt($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);

$active = null;
// 执行批处理句柄
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);
    }
}

// 关闭全部句柄
curl_multi_remove_handle($mh, $ch1);
curl_multi_remove_handle($mh, $ch2);
curl_multi_close($mh);

?>

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