Coroutine PHP CURL in Swoole


PHP CURL now can be used within Swoole Coroutine, you can run multiple CURL requests concurrently within a single process within multiple coroutines.

To enable coroutine support for PHP CURL, you have to enable the Coroutine Hook for CURL:


In the nutshell, PHP CURL is replaced with Coroutine HTTP Client API implementation if you have enabled SWOOLE_HOOK_CURL, otherwise you are using the original blocking PHP CURL which should not be used within the Coroutine context.



// enable coroutine support for PHP CURL

Co\run(function() {

    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'GET');
    curl_setopt($ch, CURLOPT_HEADER, 0);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 3);
    curl_setopt($ch, CURLOPT_TIMEOUT, 10);
    $headers = array();
    $headers[] = 'User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.163 Safari/537.36';
    curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
    $output = curl_exec($ch);
    if ($output === FALSE) {
        echo "CURL Error:". curl_error($ch). " ". $url. "\n";
        return $resp;

Check PHP Coroutine about how to execute multiple coroutines concurrently.