 name="getFirstNull()"></a><table class="detailHeader" cellpadding="0" cellspacing="0"><tr><td class="detailHeaderName">getFirstNull</td><td class="detailHeaderParens">()</td><td class="detailHeaderType">method</td><td class="detailHeaderRule">&nbsp;</td></tr></table><div class="detailBody"><code> public function getFirstNull():int</code><p></p><p></p><p>
		 Call this function to retrieve the first index set to 'null'.
		 Returns -1 if no index stores a null object.
		 
		 </p><p></p><span class="label">Ret