.. include:: /Includes.rst.txt .. index:: ! Debugging .. _examples-debug: ========= Debugging ========= Let's take a look at what debugging possibilities TYPO3 provides. .. index:: pair: Debugging; PHP GlobalDebugFunctions DebugUtility TYPO3_CONF_VARS; SYS devIPmask Debugging PHP code ================== The TYPO3 Core provides a simple :code:`debug()` (defined in :file:`EXT:core/Classes/Core/GlobalDebugFunctions.php`). It wraps around :code:`\TYPO3\CMS\Core\Utility\DebugUtility::debug()` and will output debug information only if it matches a set of IP addresses (defined in :code:`$GLOBALS['TYPO3_CONF_VARS']['SYS']['devIPmask']`). For example, the following code: .. include:: /CodeSnippets/Debugging/DebugCookies.rst.txt will produce such an output: .. include:: /Images/AutomaticScreenshots/Examples/Debugging/DebugOutput.rst.txt In general, look at class :code:`\TYPO3\CMS\Core\Utility\DebugUtility` for useful debugging tools. .. index:: pair: Debugging; Backend TYPO3_CONF_VARS; BE debug Backend debug mode ================== To display additional debug information in the backend, set :code:`$GLOBALS['TYPO3_CONF_VARS']['BE']['debug']` in the :file:`LocalConfiguration.php` and log in with an administrator account. It shows for example the names of fields and in case of select, radio and checkbox fields the values in addition, which are generated by the `FormEngine`. These can be used to set access permissions or configuration using TSConfig. If EXT:lowlevel is installed, the name of the database table or field is appended to the select options in the “Full Search” module. Additionally, in debug mode, the page renderer does not compress or concatenate JavaScript or CSS resources. .. index:: pair: Debugging; Backend language TYPO3_CONF_VARS; BE languageDebug Backend language debug ====================== Setting :code:`$GLOBALS['TYPO3_CONF_VARS']['BE']['languageDebug']` in the :file:`LocalConfiguration.php` displays the language labels (with file and key) in the TYPO3 backend :code:`FormEngine`.