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 $wgDebugToolbar variable in "LocalSettings.php":
$wgDebugToolbar = true;
The toolbar consists of multiple sections that you click to expand or collapse:
The sections are:
- An area where MediaWiki code can write messages. Superior to echoing text to the browser.
- A list of SQL queries executed on that page, with timing (requires $wgDebugDumpSql).
- Debug log
- A list of the debug messages printed during the page execution.
- 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.
Logging messages to the console
See the file
includes/debug/MWDebug.php for available functions.
Here are a few useful examples:
- Load the module at the top of your file before calling any functions.
- Must be called first to enable most other functions
MWDebug::log('your message here')
- Send an arbitrary message to the Console
MWDebug::warning('Never do that again')
- Send a warning message to the Console
MWDebug::deprecated('Function Foobar() is dead')
- Send a message to the Console about deprecated functionality, including a backtrace
MWDebug::queryTime(MWDebug::query('select foo from bar'));
- Execute the given SQL and report its time in the Queries section.