li>
<li><p class="first">Check <code class="docutils literal"><span class="pre">unset_userdata()</span></code> usage</p>
<p>Previously, this method used to accept an associative array of
<code class="docutils literal"><span class="pre">'key'</span> <span class="pre">=&gt;</span> <span class="pre">'dummy</span> <span class="pre">value'</span></code> pairs for unsetting multiple keys. That
however makes no sense and you now have to pass <em>only</em> the keys, as
the elements of an array.</p>
<div class="high