PHP function introduction—curl_multi_add_handle(): Add a cURL handle to a session with multiple handles

PHP function introduction—curl_multi_add_handle(): Add a cURL handle to a session with multiple handles

In the development of network requests, the curl function library in PHP is one of the most commonly used tool libraries. It provides many functions to perform a variety of HTTP requests, including GET and POST requests, setting request headers, sending and receiving cookies, etc.

When using the curl function library, we often encounter situations where multiple requests are sent at the same time. If a separate cURL handle is used for each request, resources will be wasted. At this time, you can use the curl_multi_add_handle() function provided by PHP to add multiple cURL handles to a session for management.

The syntax of the curl_multi_add_handle() function is as follows:

resource curl_multi_add_handle ( resource $mh , resource $ch )

The parameter $mh represents the initialized cURL session handle, and $ch represents the new cURL session handle to be added. This function will add handle $ch to handle $mh, returning a cURL multi handle.

The following is a sample code using the curl_multi_add_handle() function:

<?php
$mh = curl_multi_init();  // 初始化一个cURL会话句柄

$ch1 = curl_init();
curl_setopt($ch1, CURLOPT_URL, "https://www.example.com/api1");
curl_setopt($ch1, CURLOPT_RETURNTRANSFER, true);  // 设置返回值不直接输出
curl_multi_add_handle($mh, $ch1);  // 将第一个cURL句柄添加到会话中

$ch2 = curl_init();
curl_setopt($ch2, CURLOPT_URL, "https://www.example.com/api2");
curl_setopt($ch2, CURLOPT_RETURNTRANSFER, true);
curl_multi_add_handle($mh, $ch2);  // 将第二个cURL句柄添加到会话中

// 循环执行直到所有请求完成
do {
    $status = curl_multi_exec($mh, $running);
} while ($status === CURLM_CALL_MULTI_PERFORM || $running);

// 获取第一个请求的结果
$response1 = curl_multi_getcontent($ch1);
echo "Response 1: " . $response1 . "
";

// 获取第二个请求的结果
$response2 = curl_multi_getcontent($ch2);
echo "Response 2: " . $response2 . "
";

// 关闭会话句柄
curl_multi_remove_handle($mh, $ch1);
curl_multi_remove_handle($mh, $ch2);
curl_multi_close($mh);
?>

In the above sample code, a cURL session handle $mh is first initialized using the curl_multi_init() function. Then, two independent cURL session handles $ch1 and $ch2 are created and the requested URL and some other options are set using the curl_setopt() function. Next, use the curl_multi_add_handle() function to add $c1 and $c2 to the session handle $mh. Then, use the curl_multi_exec() function to execute multiple requests in a loop until all requests are completed. Finally, use the curl_multi_getcontent() function to obtain the results of each request and output the results.

Using the curl_multi_add_handle() function can effectively manage sessions of multiple cURL handles, improving network request efficiency and code maintainability. In actual development, we can also combine other functions such as curl_multi_remove_handle() and curl_multi_close() functions to complete more complex network request tasks.

To summarize, the curl_multi_add_handle() function is a very useful function that can add multiple cURL handles to a session for management, thereby improving the efficiency of network requests and the maintainability of the code. In actual development, we can use this function to send multiple network requests at the same time and process each request as needed.

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