title: Finding a value within an array of arrays?
body: <p>I'm familiar with using <code>in_array</code> when I want to find if a value is in an array.</p>
  <p>Is there a similar, and efficient approach, to return <code>true</code> or <code>false</code> if a value is within an array of arrays?</p>
  <pre><code>$example = array(
     array( 'small', 6789), 
     array( 'blue', 'duck', 'music'), 
     array( 1000, 'gems' ) 
  );
  </code></pre>
  <p>In the above example I would want to return <code>true</code> if I were looking for 'blue'.</p>
  <p>I know I can loop through the array and use <code>in_array</code>, but I'm sure I'm missing an easier (and faster) approach.</p>