title: Php version overridden by "config.platform.php"
body: <p>I'm trying to upgrade an application (magento) but I can't proceed as per the following error</p>
  
  <pre><code>your PHP version (7.0.22) overriden by "config.platform.php" version (7.0.2) doesnt satisfy requirements.
  </code></pre>
  
  <p>However there is <strong>not</strong> a <code>config-&gt;platform</code> setting in my composer.json. Viceversa, if I specify it or I add <code>ignore-platform-reqs</code>,s it works. </p>
  
  <p>Tried to search also for the <code>7.0.2</code> or <code>platform</code> string over all the project but I can't see any can affect composer.</p>
  
  <p>Any idea where the setting can be found?</p>