title: How to skip arguments when their default is desired
body: <p>If I have a function like this:</p>
  
  <pre><code>function abc($a,$b,$c = 'foo',$d = 'bar') { ... }
  </code></pre>
  
  <p>And I want <code>$c</code> to assume it's default value, but need to set <code>$d</code>, how would I go about making that call in PHP?</p>