How can constructors in PHP classes be structured to avoid infinite loops or circular dependencies between objects?

Constructors in PHP classes can be structured to avoid infinite loops or circular dependencies by using dependency injection. Instead of directly creating instances of other classes within a constructor, pass those instances as parameters to the constructor. This way, you can control the dependencies from outside the class and avoid circular references. 

class ClassA {
    private $classB;

    public function __construct(ClassB $classB) {
        $this->classB = $classB;
    }
}

class ClassB {
    private $classA;

    public function __construct(ClassA $classA) {
        $this->classA = $classA;
    }
}

$classA = new ClassA(new ClassB());
$classB = new ClassB($classA);

Keywords

constructors PHP classes infinite loops circular dependencies objects

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