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There are 29 error identifiers in the parameter.* group:

• Parameter pass-by-reference does not match the parent method declaration.

• Default value of a parameter is incompatible with its declared type.

• Parameter type declaration uses a deprecated class.

• Parameter type declaration uses a deprecated enum.

• Parameter type declaration uses a deprecated interface.

• Parameter type references a deprecated trait.

• Function declares the same parameter name more than once.

• Parameter has a null default value but its type is not explicitly nullable.

• Parameter type declaration uses an internal class from another package.

• Parameter type declaration uses an internal enum from another package.

• Parameter type declaration uses an internal interface from another package.

• Parameter type declaration references an internal trait from another package.

• Overriding method is missing a parameter that exists in the parent method.

• Parameter uses the parent type but the class does not extend any class.

• Parameter is not passed by reference but the parent declares it as by-reference.

• PHPDoc tag references a parameter name that does not exist in the function signature.

• Overriding method makes an optional parameter required.

• Overriding method declares a parameter as non-variadic but the parent is variadic.

• PHPDoc @param type is incompatible with the native parameter type.

• Required parameter follows an optional parameter.

• Using a superglobal variable name as a function or method parameter.

• Using $this as a function or method parameter name.

• Trait is used as a parameter type declaration, which is not allowed in PHP.

• Native union types are used but not supported by the configured PHP version.

• Parameter has a native type declaration that cannot exist at runtime.

• PHPDoc @param type contains a type expression that cannot be resolved.

• Overriding method declares a parameter as variadic but the parent is not.

• Variadic parameter is not the last parameter in the function declaration.

• Type void is used as a parameter type, which is not allowed in PHP.