selecting more than 1 table to get content from [php/Mysql]

i want to get the latest threads/messages i made my code then i made function that calls the code to show last开发者_如何学运维 messages in specific board it works great now i want to get latest messages from 2 boards or more in the same function this is the part that chooses the board

     AND b.id_board = t.id_board' . (empty($vars) ? '' : '
     AND b.id_board = ' . $vars . ''). '

i tried to use functionname(1.2.3); but he says no board with id 1.2.3 i tried ("1,2,3") same i wish i made it clear for you i apreciate your help

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I think instead of b.id_board = ' . $vars . ' you need b.id_board in (' . $vars . '), then $var would be a comma separated list of ids as a string "1,2,3". (leaving all security issues aside :) )