Sorry, but your problem does not imply a bug in PHP itself.  For a
list of more appropriate places to ask for help using PHP, please
visit http://www.php.net/support.php as this bug system is not the
appropriate forum for asking support questions. 

Thank you for your interest in PHP.

As stated in the NEWS file, this function was removed.
ADOdb has already been updated to reflect this.

You can also use this function instead

<?php

define('IBASE_DATE','ibase.dateformat');
define('IBASE_TIME','ibase.timeformat');
define('IBASE_TIMESTAMP','ibase.timestampformat');

function ibase_timefmt($format, $which = IBASE_TIMESTAMP)
{
return (bool)ini_set($which, $format);
}

But in the documentation this function is present and under WindowsXP same version of adodb is working properly. Something must be changed, isn't it.
And at last, I've installed newest version of adodb from the ports...
Anyway, thank you all for this version of PHP! =)