Template Switches and Loops
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Okay, so I've been working on a PHP/SQL blogware for some little while now and I've been getting into working on the template parser and I need a little bit of help with switches and loops.

For the record, I mean like what phpBB uses

Code:
      <!-- BEGIN switch_user_logged_out -->
      <!-- END switch_user_logged_out -->
and
Code:
       <!-- BEGIN catrow -->
         <!-- BEGIN forumrow -->
         <!-- END forumrow -->
       <!-- END catrow -->

How would I go about coding something like this? Searching through phpBB's files is a fruitless endeavor a majority of the time and I don't know what keywords to google. Neutral
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Try taking a look at the pear package HTML_TEMPLATE_IT it should accomplish that.

Well, if you still want to write something from scratch, you can use the regex routines to at least find the line and sections to match using:


Code:
// assumes lines of template are all in $lines
// uses $switches as an inverted LIFO queue of section names

$switches = array();
foreach($lines as $thisline) {
    if (preg_match('/<!-- BEGIN ([^\s]+) -->/',$thisline,&$matches)) {
        $inswitchdepth++;
        array_unshift($switches,$match[1]);
    }
    if (preg_match('/<!-- END ([^\s]+) -->/',$thisline,&$matches)) {
        if (array_shift($switches) == $matches[1]) {
            $inswitchdepth--;
        } else {
            die('FATAL: tag mismatch');
        }
    }
}
      <!-- END switch_user_logged_out -->
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