Debugging PHP UK Conference London, United Kingdom Feb 20th, 2026 Derick Rethans derick@xdebug.org @derickr@phpc.social derickr https://derickrethans.nl/talks/xdebug-phpuk26 https://xdebug.org slides/xdebug/title.xml slides/mongodb/me.xml Code reorganisation Modes - only do what is needed Reduce Configuration Options Code Improvements (algorithms, memory, etc) - xdebug_info() (demo, VS Code or PhpStorm) - an API through xdebug_info() for mode detection (VS Code or PhpStorm) 'mode' 'extension-flags' slides/xdebug/xdebug_info.xml slides/xdebug/xdebug-native-path-mapping.xml slides/xdebug/dbgp-breakpoint-types.xml slides/xdebug/exception_value.xml - exception value as pseudo-variable (VS Code) slides/xdebug/xdebug-native-path-skipping.xml - xdebug_notify() (demo, VS Code) slides/xdebug/xdebug_notify.xml - file_link_format (demo, PhpStorm) -> ticket Step debugging improvements Step debugging improvements slides/xdebug/breakpoint_resolving.xml - breakpoint resolving (demo, PhpStorm) slides/xdebug/return_value.xml - return value debugging (demo, VS Code or PhpStorm) - Xdebug will now also log a warning if an IDE attempts to set a breakpoint on a file that does not exist on the file system. (demo, PhpStorm) - xdebug_connect_to_client() (demo, PhpStorm) - xdebug://gateway and xdebug://nameserver (explain) slides/xdebug/xdebug-control-socket.xml slides/xdebug/xdebug-future-features.xml slides/xdebug/restaurant.xml slides/xdebug/why-cloud-same-host-01.xml slides/xdebug/why-cloud-same-host-02.xml slides/xdebug/why-cloud-same-network-01.xml slides/xdebug/why-cloud-same-network-02.xml slides/xdebug/why-cloud-same-network-03.xml slides/xdebug/why-cloud-same-network-04.xml slides/xdebug/why-cloud-same-network-multiple-01.xml slides/xdebug/why-cloud-same-network-multiple-02.xml slides/xdebug/why-cloud-same-network-multiple-03.xml slides/xdebug/why-cloud-same-network-multiple-04.xml slides/xdebug/why-cloud-same-network-multiple-05.xml slides/xdebug/why-cloud-foreign-network-ssh-01.xml slides/xdebug/why-cloud-foreign-network-ssh-02.xml slides/xdebug/why-cloud-foreign-network-ssh-03.xml slides/xdebug/why-cloud-foreign-network-ssh-04.xml slides/xdebug/why-cloud-foreign-network-ssh-05.xml slides/xdebug/why-cloud-foreign-network-ssh-06.xml slides/xdebug/why-cloud-cloud-01.xml slides/xdebug/why-cloud-cloud-02.xml slides/xdebug/why-cloud-cloud-03.xml slides/xdebug/why-cloud-cloud-04.xml slides/xdebug/why-cloud-cloud-05.xml slides/xdebug/why-cloud-cloud-06.xml slides/xdebug/why-cloud-cloud-08.xml slides/xdebug/why-cloud-cloud-09.xml slides/xdebug/donate.xml slides/xdebug/business-support.xml slides/xdebug/transparency.xml slides/mongodb/questions.xml slides/xdebug/resources.xml