PHP function introduction—curl_close(): Close a cURL session

PHP function introduction—curl_close(): Close a cURL session

cURL (Client URL Library) is a PHP extension library for sending and receiving HTTP requests. It provides rich functionality, including sending POST and GET requests, setting request headers, handling Cookies, etc. After making a cURL request, we need to close the cURL session in time to release resources. curl_close() The function is used to close a cURL session.

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

curl_close(resource $ch): void

$ch is a cURL handle, which is passed curl_init() Created to represent a cURL session. curl_close() will close the specified cURL session and release related resources.

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

// 创建一个 cURL 句柄
$ch = curl_init();

// 设置 cURL 选项
curl_setopt($ch, CURLOPT_URL, "https://www.example.com");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

// 执行 cURL 请求
$result = curl_exec($ch);

// 关闭 cURL 会话
curl_close($ch);

In the above sample code, we first pass curl_init() The function creates a cURL handle $ch. Then, set cURL options through the curl_setopt() function, such as setting the requested URL and whether to return a response result. Next, we call the curl_exec() function to execute the cURL request and save the response result to the variable $result. Finally, close the cURL session via the curl_close() function.

Using the curl_close() function to close the cURL session has the following benefits:

1. Save resources: After closing the cURL session, the related network connections and resources will is released to avoid resource leak problems.
2. Improve performance: After closing the cURL session, resources related to the request can be released in time to reduce the load on the server.
3. Release memory: After closing the cURL session, related variables and caches will be destroyed and the memory occupied will be released.

It should be noted that once the cURL session is closed, we can no longer use the cURL handle to send and receive requests. If we need to send a new request, we need to recreate a cURL handle.

Summary:

curl_close() The function is a PHP function used to close a cURL session. After making a cURL request, in order to save resources, improve performance and release memory, we need to call the curl_close() function in time to close the cURL session. By studying the sample code, we have mastered the basic usage of the curl_close() function and the steps to use it to close a cURL session. In actual development, we should be good at using the curl_close() function to ensure the robustness and performance of the code.

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