dump

<?php         $var1 = 'a';



        ob_start();

        $return = dump($var1);

        ob_end_clean();



        $this->assertEquals($var1, $return);

<?php         $var3 = 'c';



        ob_start();

        $return = dump($var1, $var2, $var3);

        ob_end_clean();



        $this->assertEquals([$var1, $var2, $var3], $return);

<?php echo "READY\n";



$server->listen(function (Data $data, array $context, $clientId) {

    dump((string) $data, $context, $clientId);



    exit(0);

});