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The curl_close function is used to close the current cURL session and to free all resources related to the session. After closing the session, you can no longer send requests through the session handle. curl_close is usually called after you complete the cURL operation, ensuring that resources are cleaned and memory leaks are avoided.
Usage example :
$ch = curl_init();
// set up cURL Options
curl_setopt($ch, CURLOPT_URL, "https://gitbox.net/api/example");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
// implement cURL ask
$response = curl_exec($ch);
// closure cURL Session
curl_close($ch);
In the example above, we first initialize a cURL session via curl_init . The requested URL and return transfer options are then set, and the request is executed via curl_exec . When all operations are completed, use curl_close to close the session and free up the resource.
After calling curl_close , the cURL handle becomes invalid and cannot be used anymore. If you try to use the handle again after closing the session, an error will be caused.
Unlike curl_close , the curl_reset function does not close the cURL session, but resets it to its initial state. After calling curl_reset , all options (such as URL, request method, data, etc.) of the cURL session will be cleared and restored to the default value. This function allows you to re-initiate a new request using the same session handle without having to re-initialize a new cURL session.
Usage example :
$ch = curl_init();
// set up cURL Options
curl_setopt($ch, CURLOPT_URL, "https://gitbox.net/api/example1");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
// implement第一个ask
$response1 = curl_exec($ch);
// Reset cURL Session
curl_reset($ch);
// set up新的 cURL Options
curl_setopt($ch, CURLOPT_URL, "https://gitbox.net/api/example2");
// implement第二个ask
$response2 = curl_exec($ch);
// closure cURL Session
curl_close($ch);
In this example, we initialize a cURL session via curl_init and execute the first request. After executing the first request, we cleared the previous settings through curl_reset , then reset the new URL and other options to perform the second request. In this way, curl_reset lets us reuse the same session without reinitializing the cURL session.
Although curl_close and curl_reset are functions used to manage cURL sessions, they behave differently:
Close session vs Reset session :
curl_close is used to completely close the cURL session, release all relevant resources, and cannot continue to use the session after that.
curl_reset is used to reset the session, does not release resources, but only clears the set options, allowing the same session handle to continue to be used.
Session life cycle :
curl_close is the end of the cURL session lifecycle and is suitable for cleaning resources after all operations are completed.
curl_reset is suitable for reset session options when multiple requests are performed in the same session to avoid repeated initialization of multiple cURL sessions.
Performance considerations :
If multiple requests are required and the configuration of each request is different, using curl_reset can avoid frequent calls to curl_init and curl_close , improving performance.
If you only perform a request once and you do not need to reuse the session, you should use curl_close to free up the resource.
Use curl_close : When you complete a request and no longer need to continue using the session, curl_close should be called to close the session and free up resources. Usually called immediately after the end of the script or after the request.
Use curl_reset : When you need to use the same session handle multiple times for different requests, you can use curl_reset to reset the session options, which can avoid calling curl_init and curl_close every time, improving code efficiency.
