src/ADT/List/Dictionary.php
public function has( $key )
	{
		$key	= !$this->caseSensitive ? strtolower( $key ) : $key;								//  lowercase key if dictionary is not case sensitive
		return array_key_exists( $key, $this->pairs );
	}
public function has( $key )
	{
		$key	= !$this->caseSensitive ? strtolower( $key ) : $key;								//  lowercase key if dictionary is not case sensitive
		return array_key_exists( $key, $this->pairs );
	}
public function has ( $ key ) { $ key = ! $ this -> caseSensitive ? strtolower ( $ key ) : $ key ; //  lowercase key if dictionary is not case sensitive
 return array_key_exists ( $ key , $ this -> pairs ) ; }
Indicates whether a Key is existing.
@access		public
@param		string		$key		Key in Dictionary
@return		boolean
Indicates whether a Key is existing .