style="color: #0000BB"></span><span style="color: #007700">protected&nbsp;function&nbsp;</span><span style="color: #0000BB">addValue</span><span style="color: #007700">(</span><span style="color: #0000BB">$key</span><span style="color: #007700">,</span><span style="color: #0000BB">$value</span><span style="color: #007700">,</span><span style="color: #0000BB">$expire</span><span style="color: #007700">)<br />{<br />&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;(</span><span style="color: #0000BB">NULL&nbsp;</span><spa