public final static function get(string $source, $key, $default = null){
		return Arr::get(self::decode($source), $key, $default);
	}
public final static function get(string $source, $key, $default = null){
		return Arr::get(self::decode($source), $key, $default);
	}
public final static function get ( string $ source , $ key , $ default = null ) { return Arr :: get ( self :: decode ( $ source ) , $ key , $ default ) ; }
Returns a single element from a JSON array by its key.

@param string $source
@param $key
@param $default
@return mixed
@throws \Exception
Returns a single element from a JSON array by its key .