LAST_INSERT_ID() returns the last id from a previous insert statement. If you want the most recently inserted record and are using Auto Increment Prime keys, you can use the code below:
SELECT MAX( id ) FROM subscription;
If you need to know what the NEXT id will be, you can get this from INFORMATION_SCHEMA
SELECT AUTO_INCREMENT FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'test'
mysql_insert_id
