When making network requests using PHP, the cURL library is commonly used to send requests. The cURL library provides many useful functions, one of which is the <span>curl_multi_close()</span> function. This function is used to close multiple cURL sessions.
<span>curl_multi_close()</span> function effectively releases the resources occupied by multiple cURL sessions created by the <span>curl_multi_init()</span> function. It is a good practice to close the sessions using the <span>curl_multi_close()</span> function after completing all requests and processing the responses.
Code Example: Below is a code example using the <span>curl_multi_init()</span> and <span>curl_multi_close()</span> functions:
<?php
// Create multiple cURL sessions
$multiHandle = curl_multi_init();
// Add the first request
$ch1 = curl_init();
curl_setopt($ch1, CURLOPT_URL, 'https://example.com/api/1');
curl_setopt($ch1, CURLOPT_RETURNTRANSFER, true);
curl_multi_add_handle($multiHandle, $ch1);
// Add the second request
$ch2 = curl_init();
curl_setopt($ch2, CURLOPT_URL, 'https://example.com/api/2');
curl_setopt($ch2, CURLOPT_RETURNTRANSFER, true);
curl_multi_add_handle($multiHandle, $ch2);
// Execute and wait for all requests to complete
// ...
// Close sessions
curl_multi_close($multiHandle);
?>In the code above, the <span>curl_multi_init()</span> function is first used to create a handle for multiple cURL sessions. Then, the <span>curl_init()</span> function initializes two independent cURL sessions, setting different URLs and other options, and uses the <span>curl_multi_add_handle()</span> function to add them to the multiple cURL session.
After that, the code to execute all requests and wait for them to complete (this part is not shown in this example) ensures that all requests are executed. Finally, the <span>curl_multi_close()</span> function is used to close the handle for multiple cURL sessions, thereby releasing the occupied resources.
Conclusion
<span>curl_multi_close()</span> function is a very convenient and important function for closing multiple cURL sessions created by the <span>curl_multi_init()</span> function. Using this function ensures timely resource release and improves application performance. When handling network requests, be sure to use this function appropriately.