<span style="color: #007700">[</span><span style="color: #0000BB">$this</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">references</span><span style="color: #007700">[</span><span style="color: #0000BB">$key</span><span style="color: #007700">]]=</span><span style="color: #0000BB">$value</span><span style="color: #007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;else&nbsp;if(isset(</span><span style="color: #0000BB">$this</span><span style="c