Square brackets tags

Hi All,

I hope this is the right list to post my question.

I need to write a PHP extension or a PHP template system (this is the
question) to parse some commands enclosed in square brackets inside web
pages. Please note that the commands are in the form [command1] and not
<?php [command1] ?>.
I want use PHP because these commands needs to be remapped with a "web
oriented" language.

Is it technically possible to remap these square brackets tags to php?
And if yes, what is the best way? A custom template system or a C PHP
extension?

Thanks a lot.

Best regards,
Marco Bambini
Italy