title: PhpStorm do not recognize native PHP functions
body: <p>I have no idea why, but PhpStorm do not recognize all PHP native functions. For example, when I type:</p>
  
  <pre><code>$len = strlen($str);
  </code></pre>
  
  <p>The <code>strlen</code> function is highlighted in orange with the error text <code>undefined function strlen</code>.</p>
  
  <p>Everything else is working fine. It's like if everything was loaded except the PHP built-in library.</p>
  
  <p>I'm using the last version of PhpStorm (installed 1 week ago on a new computer).</p>
  
  <p>Regards,</p>