There used to be filter_geshi available for the syntax highlighting but is was removed. See MoodleDocs:Style_guide#PHP_syntax_highlighting that does not need any additional filter
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Note: You are currently viewing documentation for Moodle 3.10. Up-to-date documentation for the latest stable version of Moodle may be available here: Code syntax highlighting.
There used to be filter_geshi available for the syntax highlighting but is was removed. See MoodleDocs:Style_guide#PHP_syntax_highlighting that does not need any additional filter