src/ADT/CSS/Sheet.php
public function has( $selector, $key = NULL ){
		$rule = $this->getRuleBySelector( $selector );
		if( $rule )
			return !$key ? TRUE : $rule->has( $key );
		return FALSE;
	}
public function has( $selector, $key = NULL ){
		$rule = $this->getRuleBySelector( $selector );
		if( $rule )
			return !$key ? TRUE : $rule->has( $key );
		return FALSE;
	}
public function has ( $ selector , $ key = NULL ) { $ rule = $ this -> getRuleBySelector ( $ selector ) ; if ( $ rule ) return ! $ key ? TRUE : $ rule -> has ( $ key ) ; return FALSE ; }
Indicates whether a property is existing by its key.
@access		public
@param		string			$selector	Rule selector
@return		boolean
Indicates whether a property is existing by its key .