combining 2 arrays

Hi list! I read data from 2 databases and for the purpose of displaying the information at my web interface as one piece I need to combine the data into one array first.. Here is my problem: Firstly, it reads from first DB and get this array: (it's a sum of server names in table) arrayDB1 = array(array('8', 'SER'), array('5','Asterisk')) When finished then it starts reading from second DB where I would get arrayDB2 = array(array('6', 'XIP'), array('4','Asterisk')) Is there any function where I would get result = array(array('8', 'SER'), array('9','Asterisk'), array('6','XIP')) Probably, it would be best to add number of Asterisk while cycling through data of second DB. The problem could be when databases have thousands of rows in each DB. I'm just asking in case you know a better approach. Thank you, Lada