public function offsetExists($offset) {
		return ($this->isCollection)?
				 isset($this->data[$offset])
				:isset($this->data->{$offset});
	}
public function offsetExists($offset) {
		return ($this->isCollection)?
				 isset($this->data[$offset])
				:isset($this->data->{$offset});
	}
public function offsetExists ( $ offset ) { return ( $ this -> isCollection ) ? isset ( $ this -> data [ $ offset ] ) : isset ( $ this -> data -> { $ offset } ) ; }
Check if provided offset exists

@param  string $offset

@return boolean
Check if provided offset exists