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SF2 dependency injection component PHP class

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SF2 dependency injection component PHP class

<?php
namespace Symfony\Component\DependencyInjection;
use Symfony\Component\DependencyInjection\Exception\BadMethodCallException;
use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
use Symfony\Component\DependencyInjection\Exception\OutOfBoundsException;
class ChildDefinition extends Definition
{
    private $parent;
    public function __construct(string $parent)
    {
        $this->parent = $parent;
        $this->setPrivate(false);
    }
    public function getParent()
    {
        return $this->parent;
    }

What is dependency injection?

IOC: English full name: Inversion of Control, Chinese name: Inversion of Control, it also has another name called Dependency Injection (DI). When an instance of a class requires the assistance of an instance of another class, in the traditional programming process, the caller usually creates an instance of the callee. With dependency injection, the work of creating the callee is no longer done by the caller, so it is called inversion of control. The work of creating the instance of the callee is done by the IOC container, and then injected into the caller, so it is also called Dependency injection.

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