By default, PHPMD has the following two checks which I believe are problematic:
The camelCase variable names apply to Zend and Symfony but not Drupal and Wordpress.
Avoiding "else" statements is controversial: I don't believe there is consensus that the use of else statements correlates with poor code. And it is a little redundant in that it would be caught by Cyclomatic Complexity and NPath Complexity metrics.
Proposed Resolution
Turn off the CamelCaseClassName, CamelCasePropertyName, CamelCaseMethodName, CamelCaseParameterName, CamelCaseVariableName checks by default.
Problem
By default, PHPMD has the following two checks which I believe are problematic:
Proposed Resolution