Debugging - gtbu/Typesetter5.2 GitHub Wiki
Typesetter has inbuilt debugging : To activate, You have to edit the gpconfig.php in the root-directory.
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169 defined('gpdebug') or define('gpdebug',true);
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177 define('gpdebugjs',false);
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evtl. 186 @ini_set('display_errors',1); <- also a hook in the CMS
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206 define('notify_deprecated',true); -- set to false if You dont not want to see deprecation-popups (deprecations are bugs in the next php-version ( in php-8 this is php-9)
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W3schools has published about PHP-Errorhandling .
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For PHP exist further possibilities with free tools like xdebug and Online-debugger.
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Tools like phpstorm cost monthly fees. For the free Visual Studio Code - IDE exists plugins like php-codesniffer.
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A Mozilla - site about css-debugging with firefox