1.2.322. DI Cyclic Dependencies

When injecting dependencies, classes that mutually depend on each other is a code smell.

Dependency injection should be organized as an acyclic tree-like structure

<?php

// Classes A and B depends on each other.
class A {
    protected $b;

    public function __construct(B $b) {
        $this->b = $b;
    }
}

class B {
    public $a;

    protected function setA(A $a) {
        $this->a = $a;
    }
}
?>

See also Dependency Injection Smells.

1.2.322.1. Specs

Short name	Classes/TypehintCyclicDependencies
Rulesets	All, Changed Behavior
Exakat since	0.11.6
PHP Version	All
Severity
Time To Fix
Precision	Very high
Features	injection
Available in	Entreprise Edition, Exakat Cloud