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

MissingImport

Since: 2.7.0

Importing all external classes in a file through use statements makes them clearly visible.

Example

function make() {
    return new \stdClass();
}

Source http://phpmd.org/rules/cleancode.html#MissingImport

BooleanGetMethodName

Since: 0.2

Looks for methods named 'getX()' with 'boolean' as the return type. The convention is to name these methods 'isX()' or 'hasX()'.

Example

class Foo {
    /**
     * @return boolean
     */
    public function getFoo() {} // bad
    /**
     * @return bool
     */
    public function isFoo(); // ok
    /**
     * @return boolean
     */
    public function getFoo($bar); // ok, unless checkParameterizedMethods=true
}

Source https://phpmd.org/rules/naming.html#booleangetmethodname