Joomla and str replace

[eK3eKyToPa]

Somewhere in this forum i found this code

<?php
function callback($buffer)
{
return (str_replace("change this", "into this", $buffer));
}
ob_start("callback");
?>

Which works perfect for changing a part of the text on ordinary page.
But when put this code on the main page of Joomla (the template) it dont change anything
Please give some alternative to test, or say how to troubleshoot the problem
Thanks

Regards
eK3eKyToPa

[coopster]

Output buffers are stackable so if other buffers are active you may need to determine where you are in the stack. ob_get_level [php.net] may be the tool you need.