When should curl_close () be used?

Question

The below script will run endlessly and will be triggered using php myscript.php .

http://example.com/longpolling.php will only respond if it has something to communicate with php myscript.php and the request below curl expires before longpolling.php reaches its time limit .

Should I close and reopen the curl of each cycle or keep it open indefinitely.

 <?php // php myscript.php $options=[ CURLOPT_URL=>'http://example.com/longpolling.php', CURLOPT_RETURNTRANSFER=>true, CURLOPT_CONNECTTIMEOUT => 300, CURLOPT_TIMEOUT=> 300 ]; $ch = curl_init(); curl_setopt_array( $ch, $options ); while (true) { $rsp = curl_exec( $ch ); // Do something //curl_close( $ch ); //should I close and reopen? } 

Answer 1

If the URLs are on the same server, reusing the handle will increase performance. cURL will reuse the same TCP connection for each HTTP request to the server.

It is also a good benchmark for this problem.

Answer 2

You are missing the exit condition. Assuming this is a response from a remote script, your code should be:

 <?php // php myscript.php $options=[ CURLOPT_URL=>'http://example.com/longpolling.php', CURLOPT_RETURNTRANSFER=>true, CURLOPT_CONNECTTIMEOUT => 300, CURLOPT_TIMEOUT=> 300 ]; $ch = curl_init(); curl_setopt_array( $ch, $options ); $rsp = false; while (!$rsp) { $rsp = curl_exec( $ch ); } curl_close( $ch ); // Do something