Worst PHP practice found in your experience?
<p>What are the worst practices found in PHP code?</p>

<p>Some examples:</p>

<ul>
<li>Use of $array[reference] without single quotes</li>
<li>Instance "hidden" variables into inclusion files, which are needed later</li>
<li>Lots of recursive inclusion not using "_once" functions</li>
</ul>

<p><em>Note</em>: maybe subjective or "fun" if you like.</p>
