title: Downgrade from default PHP 7.1 to PHP 7 on macOS High Sierra
body: <p>I have a fresh installation of <code>macOS High Sierra</code> which comes with <code>PHP 7.1.16</code> (Build date: Mar 31 2018 02:53:20) installed. I would like to <em>downgrade</em> this to <code>PHP 7.0.27</code>.</p>
  
  <p><code>PHP 7.1.16</code> wasn't installed with <code>homebrew</code>, so I assume it's not as easy as removing it and installing <code>PHP 7</code> with <code>brew</code>.</p>
  
  <p>What is the best and safest way to do this?</p>
  
  <p>There's many resources to upgrade from PHP 7 -> 7.1 or 7 -> 7.2, but nothing to go the other way on macOS.</p>
  
  <pre><code>PHP 7.1.16 (cli) (built: Mar 31 2018 02:59:59) ( NTS )
  Copyright (c) 1997-2018 The PHP Group
  Zend Engine v3.1.0, Copyright (c) 1998-2018 Zend Technologies
  </code></pre>