Debug Bar

PHP Debug Bar (php-debugbar/php-debugbar v3.7). Shows at bottom of every page.

Collectors

Tab	Data
PHP	PHP version, extensions
Messages	Custom log messages
Request	`$_GET`, `$_POST`, `$_SERVER`, `$_COOKIE`, `$_SESSION`
Timeline	Execution time measurements
Memory	Memory usage stats
Exceptions	Caught exceptions + PHP errors
Config	`$CFG` (secrets/passwords excluded)
Moodle	Moodle version, PHP version, debug mode, language
String Manager	`get_string()` calls (only when custom string manager enabled)
Database	SQL query log (if enabled in settings)

Logging


\local_devkit\local\debugbar::log('message');
\local_devkit\local\debugbar::log('error happened', \local_devkit\local\log_level::ERROR);

Levels: alert, critical, debug, emergency, error, info, notice, success, warning.

Measuring


$result = \local_devkit\local\debugbar::measure('slow operation', function () {
    // Do stuff.
    return $output;
});

Shows in Timeline + Messages tabs.

Exceptions


try {
    // Risky code.
} catch (\Throwable $e) {
    \local_devkit\local\debugbar::log_exception($e);
}

Also auto-catches all PHP errors/exceptions via custom handlers.

Editor Links

File paths in debug bar are clickable. Choose editor in settings.

23 editors: sublime, textmate, emacs, macvim, codelite, phpstorm, phpstorm-remote, idea, idea-remote, vscode, vscode-insiders, vscode-remote, vscode-insiders-remote, vscodium, nova, xdebug, atom, espresso, netbeans, cursor, cursor-remote, windsurf, zed, antigravity.

Redirect Stacking

Debug data persists across redirects via SQLite at $CFG->tempdir/local_devkit/debugbar.sqlite. Prunes to 1 dataset.

URL: /local/devkit/debugbar/open.php (requires login).

AJAX

Debug bar binds to fetch and XHR requests. Shows AJAX debug tab.

See Configuration for AJAX setup.