Since: PHPMD 0.2

Accessing a super-global variable directly is considered a bad practice. These variables should be encapsulated in objects that are provided by a framework, for instance.

Example:

class Foo {
      public function bar() {
          $name = $_POST['foo'];
      }
  }

Source: http://phpmd.org/rules/controversial.txt

Since: PHPMD 0.2

Accessing a super-global variable directly is considered a bad practice. These variables should be encapsulated in objects that are provided by a framework, for instance.

Example:

class Foo {
      public function bar() {
          $name = $_POST['foo'];
      }
  }

Source: http://phpmd.org/rules/controversial.txt

Since: PHPMD 0.2

Accessing a super-global variable directly is considered a bad practice. These variables should be encapsulated in objects that are provided by a framework, for instance.

Example:

class Foo {
      public function bar() {
          $name = $_POST['foo'];
      }
  }

Source: http://phpmd.org/rules/controversial.txt

Cognitive Complexity

Cognitive Complexity is a measure of how difficult a unit of code is to intuitively understand. Unlike Cyclomatic Complexity, which determines how difficult your code will be to test, Cognitive Complexity tells you how difficult your code will be to read and comprehend.

A method's cognitive complexity is based on a few simple rules:

• Code is not considered more complex when it uses shorthand that the language provides for collapsing multiple statements into one
• Code is considered more complex for each "break in the linear flow of the code"
• Code is considered more complex when "flow breaking structures are nested"

Further reading

• Cognitive Complexity docs
• Cognitive Complexity: A new way of measuring understandability

Since: PHPMD 1.4.0

A boolean flag argument is a reliable indicator for a violation of the Single Responsibility Principle (SRP). You can fix this problem by extracting the logic in the boolean flag into its own class or method.

Example:

class Foo {
      public function bar($flag = true) {
      }
  }

Source: http://phpmd.org/rules/cleancode.txt

Since: PHPMD 0.2

It is considered best practice to use the camelCase notation to name variables.

Example:

class ClassName {
      public function doSomething() {
          $data_module = new DataModule();
      }
  }

Source: http://phpmd.org/rules/controversial.txt