Oops

example.php

@@ -13,6 +13,7 @@ require __DIR__ . '/vendor/autoload.php';
 $selenium = new Symfony\Component\Process\ProcessBuilder();
 $selenium->setPrefix(__DIR__ . '/vendor/bin/selenium-server-standalone');
 $process = $selenium->getProcess();
+$process->start();
 $process->wait(function() use($process) {
   while(false == $process->isRunning()) {
     print 'Waiting ...';