custom_rules.rst

Creating custom rules

If you need to enforce some specific code style rules, you can implement your own fixers.

For each rule you want to add, create a class that implements PhpCsFixer\Fixer\FixerInterface. Note that there is a specific constraint regarding custom rules names: they must match the pattern /^[A-Z][a-zA-Z0-9]*\/[a-z][a-z0-9_]*$/.

Then register your custom fixers and enable them in the config file:

There are several interfaces that your fixers can also implement if needed:

• PhpCsFixer\Fixer\DefinedFixerInterface: allows to describe what the fixer does in details;
• PhpCsFixer\Fixer\WhitespacesAwareFixerInterface: for fixers that need to know the configured indentation and line endings;
• PhpCsFixer\Fixer\ConfigurableFixerInterface: to create a configurable fixer;
• PhpCsFixer\Fixer\DeprecatedFixerInterface: to deprecate a fixer.