PHP cURL cookie not saved after curl

I couldn't access the cookie file after curl_close() although it's created successfully (not a file path issue). So, I added a 15 seconds of sleep after curl_close() and I noticed that the cookie file is created only after the 15 seconds, i.e. after the whole php file ends.

        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_HEADER, 1);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_COOKIEJAR, $cookie_file);
        $response = curl_exec($ch);
        curl_close($ch);

        //I can't find the cookie file here
    
        sleep(15);

CodePudding user response：

According to this:

The name of a file to save all internal cookies to when the handle is closed, e.g. after a call to curl_close.

The file is saved when curl_close is called or when the class is destructed.