dead code

363 (<1)
phpdcd — Dead Code Detector (DCD) for PHP code.
Similar dead code
81 (<1)
tombstone — Dead code detection with tombstones for PHP
Similar dead code

Some additional repos to consider:
alheim/phpdcd — This php script analyzes a file containing a class and detects the dead code (unused function). Works with private, public and static methods.
DeadlinkChecker — Code to determine if a link on the web is dead or alive
dead 1.3.1 — dead code elimination toolbox
laravel-tdd-example — Code examples from my talk "TDD is Dead, Long Live TDD"

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