What are some examples of the limitations of PHP with JavaScript?
<p>I'm looking for problems I can generalize, recognize later (in design), and say</p>

<blockquote>
  <p><em>"Hey, if I continue down this road I'm going to hit trouble. PHP + JS just weren't meant for this."</em></p>
</blockquote>

<p>If I'm using PHP+JS what can't I do? What shouldn't I attempt? What do you suggest instead?</p>
