title: PHP Parse error with Symfony in bin/console file
body: <p>I am using Symfony 4.0. I am also using MAMP with PHP 7.2. After installing Symfony, I could not run the application. I stumbled into a PHP Parse error in the bin/console file. The parse error is at line 26 which reads: </p>
  
  <pre><code>$env = $input-&gt;getParameterOption(['--env', '-e'], $_SERVER['APP_ENV'] ?? 'dev');
  </code></pre>
  
  <p>Any idea why that line produces a parse error? </p>