"pre">$_POST</span></code> array keys) without first
checking to see that it <code class="docutils literal"><span class="pre">isset()</span></code>.</p>
<p>Make sure that your dev environment has error reporting enabled
for ALL users, and that display_errors is enabled in the PHP
environment. You can check this setting with:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">if</span> <span class="p">(</span><span class="nb">ini_get</span><span class="p">(</span><span cla