use db wrappers in php don't write to mysql only

well pdo in php is very buggy , in fact i call it buggy as hell ,
http://www.alberton.info/php_pdo_firebird_status.html
http://forums.devshed.com/firebird-sql-development-61/firebird-and-php-pdo-functions-327659.html
I would recommend to use an stable wrapper around ibase/mysql functions
the one from cakephp is very well done you can find them in the cake
php source code
http://api.cakephp.org/class/dbo-firebird

also there is mdb2 with an good firebird/ibase driver

http://pear.php.net/package/MDB2
http://pear.php.net/package/MDB2_Driver_ibase/

also i have seen the adodb for php
http://adodb.sourceforge.net/
http://sourceforge.net/project/showfiles.php?group_id=42718