Debugging toolbar

The debugging toolbar is a utility for developers that displays debug information about a MediaWiki page at the bottom of the browser window.

You can enable it with the  variable in "LocalSettings.php":

The toolbar
The toolbar consists of multiple sections that you click to expand or collapse:


 * [[File:debugging-toolbar.png]]

The sections are:


 * Console: An area where MediaWiki code can write messages. Superior to echoing text to the browser.
 * Queries: A list of SQL queries executed on that page, with timing (requires ).
 * Debug log: A list of the debug messages printed during the page execution.
 * Request: HTTP request information.
 * PHP includes: A list of included PHP files during the page execution.
 * The rest: Statistics about the software versions, execution time, and memory used.

Click any section to expand it and see the data.

Click it again to close. Use your browser's Find feature to search the data.

The MediaWiki and PHP links lead to their respective websites (https://www.mediawiki.org and https://php.net).

Logging messages to the console
See the file   for available functions.

Here are a few useful examples:


 * Must be called first to enable most other functions
 * Must be called first to enable most other functions


 * Send an arbitrary message to the Console
 * Send an arbitrary message to the Console


 * Send a warning message to the Console
 * Send a warning message to the Console


 * Send a message to the Console about deprecated functionality, including a backtrace
 * Send a message to the Console about deprecated functionality, including a backtrace


 * Execute the given SQL and report its time in the Queries section.
 * Execute the given SQL and report its time in the Queries section.