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With $padToolbar = 'local' every web page of a local request carries a collapsible bar at its foot: what the engine collected while it rendered the page. This page switches it on for itself, so opened on your own machine the bar stands below.

<?php

  $padToolbar = 'local';

  $colors = [ [ 'color' => 'red' ], [ 'color' => 'green' ] ];

?>

{colors}<span>{$color}</span> {/colors}

The fragment shows the setting in a page's PHP; an application sets it once in _config/config.php.

What it shows

• The summary - application and page, the time and peak memory, how many levels the engine opened, how many SQL statements ran, and whether the page cache was off, hit or missed; fragment cache hits and misses when there were any.
• Request - the same figures with the size of the output.
• Tags - the tag tree: every tag that opened a level, indented by its depth, with its type.
• SQL - every statement, in the order it ran.
• Templates - the template files read: wrappers, the page, snippets, the .pad halves of tags.
• Variables and Session - the application's own variables and the session, credentials redacted.

Who sees it

Only a local request: the command line, or this machine asking itself with nothing forwarded - the same test the full error report uses, and $padDiagnostics = FALSE closes it the same way. A visitor never gets it, whatever the setting. It is left out of a bare fragment (&padInclude), of anything that is not an HTML page answering 200, and of the page cache: it is added on the way out, after the cache stored the page.