array function array_to_rows in postgresql

CREATE OR REPLACE FUNCTION array_to_rows(myarray ANYARRAY) RETURNS SETOF
ANYELEMENT AS $$
  BEGIN
    FOR j IN 1..ARRAY_UPPER(myarray,1) LOOP
      RETURN NEXT myarray[j];
    END LOOP;
    RETURN;
  END;
$$ LANGUAGE 'plpgsql';