Using curl_close() to Properly Close cURL Sessions in PHP

cURL (Client URL Library) is a PHP extension used for sending and receiving HTTP requests, offering features such as POST/GET requests, custom headers, and cookie handling. After completing a cURL request, the curl_close() function should be called to close the session and free resources.

The syntax of curl_close() is straightforward: curl_close(resource $ch): void , where $ch is the cURL handle created by curl_init() .

Example usage:

// Create a cURL handle
$ch = curl_init();
// Set cURL options
curl_setopt($ch, CURLOPT_URL, "https://www.example.com");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
// Execute the request
$result = curl_exec($ch);
// Close the cURL session
curl_close($ch);

In this example, a cURL handle is initialized, options are set to specify the target URL and to return the response as a string, the request is executed, and finally the session is closed with curl_close() .

Closing a cURL session provides several advantages: it saves resources by releasing network connections, improves performance by reducing server load, and frees memory by destroying related variables and caches. After closing, the handle cannot be reused; a new handle must be created for additional requests.

In summary, curl_close() is essential for terminating a cURL session in PHP, ensuring efficient resource usage and robust code performance.