Using curl_close() to Properly Close cURL Sessions in PHP

cURL (Client URL Library) is a PHP extension for sending and receiving HTTP requests. After completing a cURL request, the curl_close() function should be called to close the cURL session and release resources.

The syntax of curl_close() is:

curl_close(resource $ch): void

The $ch parameter is a cURL handle created by curl_init() , representing an active cURL session. Calling curl_close() with this handle terminates the session and frees associated resources.

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 cURL request
$result = curl_exec($ch);

// Close the cURL session
curl_close($ch);

In the example, curl_init() creates the handle, curl_setopt() configures the request URL and return behavior, curl_exec() performs the request, and finally curl_close() releases the session.

Closing a cURL session with curl_close() offers several advantages:

Resource savings: network connections and related resources are released, preventing leaks.

Performance improvement: freeing request‑related resources reduces server load.

Memory release: variables and caches tied to the session are destroyed, freeing memory.

Summary

The curl_close() function is used to close a cURL session in PHP. After each request, invoking this function conserves resources, enhances performance, and releases memory, ensuring robust and efficient code.