Discussion : Aura DI lazy function called each time https://groups.google.com/d/msg/auraphp/Ndh4pHM3m_k/PZdhOXtBAgAJ

composer.json

{
    "require": {
        "aura/di": "^3.2"
    }
}

index.php

<?php
require __DIR__ . '/vendor/autoload.php';

class Hello
{
    public $database;

    public function __construct()
    {
        $this->database = 'yes';
    }
}

class World
{
    public function __construct()
    {
    }

    public function process()
    {
        var_dump("What ?");
    }
}

use Aura\Di\ContainerBuilder;

$builder = new ContainerBuilder();
$di = $builder->newInstance();

$di->set('config', $di->lazyNew(Hello::class));

$di->set('pdo', $di->lazy(function () use ($di) {
    echo "Called once ?";

    $config = $di->get('config');

    if($config->database){
        return $di->lazyNew(World::class)();
    } else {
        return null;
    }
}));

$di->get('pdo'); // configuration is checked
$di->get('pdo'); // configuration is checked again :(