framework/collections/CAttributeCollection.php
public function __isset($name)
	{
		if($this->contains($name))
			return $this->itemAt($name)!==null;
		else
			return parent::__isset($name);
	}
public function __isset($name)
	{
		if($this->contains($name))
			return $this->itemAt($name)!==null;
		else
			return parent::__isset($name);
	}
public function __isset ( $ name ) { if ( $ this -> contains ( $ name ) ) return $ this -> itemAt ( $ name ) !== null ; else return parent :: __isset ( $ name ) ; }
Checks if a property value is null.
This method overrides the parent implementation by checking
if the key exists in the collection and contains a non-null value.
@param string $name the property name or the event name
@return boolean whether the property value is null
Checks if a property value is null . This method overrides the parent implementation by checking if the key exists in the collection and contains a non - null value .