Which is more efficent PHP: array_intersect() OR array_intersect_key()
<p>Is it more efficient to use the key intersect or the value intersect if both key and value have the same contents for example:</p>

<pre><code>Array
(
    [743] =&gt; 743
    [744] =&gt; 744
    [745] =&gt; 745
    [746] =&gt; 746
    [747] =&gt; 747
    [748] =&gt; 748
)
</code></pre>

<p>Is there any difference in performance in using one or the other with the same values. Similar to the difference of using double or single quotes?</p>
