How can I find unused functions in a PHP project

Question

How can I find any unused functions in a PHP project?

Are there features or APIs built into PHP that will allow me to analyse my codebase - for example Reflection, token_get_all()?

Are these APIs feature rich enough for me not to have to rely on a third party tool to perform this type of analysis?

Answer 1

You can try Sebastian Bergmann's Dead Code Detector:

phpdcd is a Dead Code Detector (DCD) for PHP code. It scans a PHP project for all declared functions and methods and reports those as being "dead code" that are not called at least once.

Source: https://github.com/sebastianbergmann/phpdcd

Note that it's a static code analyzer, so it might give false positives for methods that only called dynamically, e.g. it cannot detect $foo = 'fn'; $foo();

You can install it via PEAR:

pear install phpunit/phpdcd-beta 

After that you can use with the following options:

Usage: phpdcd [switches] <directory|file> ...  --recursive Report code as dead if it is only called by dead code.  --exclude <dir> Exclude <dir> from code analysis. --suffixes <suffix> A comma-separated list of file suffixes to check.  --help Prints this usage information. --version Prints the version and exits.  --verbose Print progress bar. 

More tools:

• https://phpqa.io/

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Note: as per the repository notice, this project is no longer maintained and its repository is only kept for archival purposes. So your mileage may vary.