title: Change PHP version used by Composer on Windows
body: <p>I have already use WAMP 2.5 with PHP 5.5.12, and with Composer.
  The php is on:</p>
  
  <pre><code>C:\wamp\bin\php\php5.5.12
  </code></pre>
  
  <p>For new project, I need to use nginx and installed PHP 7.
  The php is on:</p>
  
  <pre><code>C:\nginx\php
  </code></pre>
  
  <p>Now, using GitBash MINGW32, I tried to install laravel 5.3 using Composer <code>create-project</code> but it said</p>
  
  <pre><code>[InvalidArgumentException]
  Could not find package laravel/laravel with version 5.3 in a version 
  installable using your PHP version 5.5.12.
  </code></pre>
  
  <p>I already put both <code>C:\wamp\bin\php\php5.5.12</code> and <code>C:\nginx\php</code> on Windows System PATH variable.</p>
  
  <p>How do I change the PHP version used by Composer? </p>