title: What is this array ternary like in php
body: <p>I am reviewing some code in php that use zend framework in some statements they use something like: 
      <code>$where['uniqueid = ?'] = $songid;</code>
  what means that <code>'foo = ?'</code> key in the array.
  sorry if i wasn't very specific because don't know how to call that statement and i didn't found something about it.</p>