Allow multiple users to change functions in MySQL
As MySQL's documentation says:


  The ALL or ALL PRIVILEGES privilege specifier is shorthand. It stands
  for “all privileges available at a given privilege level” (except
  GRANT OPTION). For example, granting ALL at the global or table level
  grants all global privileges or all table-level privileges.


Just use: 

GRANT ALL ON test.* TO 'admin'@'%';
FLUSH PRIVILEGES;


Test:

mysql&gt; CREATE USER 'admin'@'%' IDENTIFIED BY 'test';
Query OK, 0 rows affected (0.01 sec)

mysql&gt; CREATE USER 'devel1'@'%' IDENTIFIED BY 'test';
Query OK, 0 rows affected (0.00 sec)

mysql&gt; GRANT ALL ON test.* TO 'admin'@'%';
Query OK, 0 rows affected (0.00 sec)

mysql&gt; GRANT ALL ON test.* TO 'devel1'@'%';
Query OK, 0 rows affected (0.00 sec)

mysql&gt; FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.00 sec)

mysql&gt; SHOW GRANTS FOR 'devel1'@'%';
+-------------------------------------------------------------------------------------------------------+
| Grants for devel1@%                                                                                   |
+-------------------------------------------------------------------------------------------------------+
| GRANT USAGE ON *.* TO 'devel1'@'%' IDENTIFIED BY PASSWORD '*94BDCEBE19083CE2A1F959FD02F964C7AF4CFC29' |
| GRANT ALL PRIVILEGES ON `test`.* TO 'devel1'@'%'                                                      |
+-------------------------------------------------------------------------------------------------------+
2 rows in set (0.00 sec)

mysql&gt; SHOW GRANTS FOR 'admin'@'%';
+------------------------------------------------------------------------------------------------------+
| Grants for admin@%                                                                                   |
+------------------------------------------------------------------------------------------------------+
| GRANT USAGE ON *.* TO 'admin'@'%' IDENTIFIED BY PASSWORD '*94BDCEBE19083CE2A1F959FD02F964C7AF4CFC29' |
| GRANT ALL PRIVILEGES ON `test`.* TO 'admin'@'%'                                                      |
+------------------------------------------------------------------------------------------------------+
2 rows in set (0.00 sec)