Symfony dependency injection and your own services

Question

I am trying to register my own class as a services with help of symfony dependency injection component, but i have problems with class loading.

I have file structure as this:

My Generator class is simple

<?php

namespace Localhost\Service\String;

class Generator {

    private $iStringLength;

    public function __construct($iNewStringLength = 5) {
        $this->iStringLength = $iNewStringLength;
    }

    public function getRandomString() {
        $sChars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
        $sRandChar = substr(str_shuffle(str_repeat($sChars,5)),0, $this->iStringLength);

        return $sRandChar;
    }
}

And Index is

<?php

require_once 'vendor/autoload.php';

/*
spl_autoload_register(function ($sClass) {
    echo $sClass;
    require_once str_replace('\\', '/', $sClass) . '.php';
});
*/

use Localhost\Service\String\Generator;

/*
$oStringGenerator = new Generator(55);
echo $oStringGenerator->getRandomString();
*/

use Symfony\Component\DependencyInjection\ContainerBuilder;

$oContainer = new ContainerBuilder();
$oContainer
    ->register('generator', 'Generator')
    ->addArgument('15');

$oGeneratorService = $oContainer->get('generator');
echo $oGeneratorService->getRandomString();

What i am getting is an error

Fatal error: Uncaught exception 'ReflectionException' with message 'Class Generator does not exist' in D:\Localhost\Apache\htdocs\Test\vendor\symfony\dependency-injection\Symfony\Component\DependencyInjection\ContainerBuilder.php:959 Stack trace: #0 D:\Localhost\Apache\htdocs\Test\vendor\symfony\dependency-injection\Symfony\Component\DependencyInjection\ContainerBuilder.php(959): ReflectionClass->__construct('Generator') #1 D:\Localhost\Apache\htdocs\Test\vendor\symfony\dependency-injection\Symfony\Component\DependencyInjection\ContainerBuilder.php(493): Symfony\Component\DependencyInjection\ContainerBuilder->createService(Object(Symfony\Component\DependencyInjection\Definition), 'generator') #2 D:\Localhost\Apache\htdocs\Test\index.php(26): Symfony\Component\DependencyInjection\ContainerBuilder->get('generator') #3 {main} thrown in D:\Localhost\Apache\htdocs\Test\vendor\symfony\dependency-injection\Symfony\Component\DependencyInjection\ContainerBuilder.php on line 959

Or as a picture

Answer 1

Solution is simple, i forgot to modify composer config to load my services

"autoload": {
    "psr-0": {"Localhost": "src/"}
},

Answer 2

$oContainer = new ContainerBuilder();
$oContainer
    ->register('generator', 'Localhost\Service\String\Generator')
    ->addArgument('15');

Answer 3

Edit: Since Symfony 3.3+ (May 2017) you can use register() class name service shortcut:

$containerBuilder = new ContainerBuilder();
$containerBuilder->register(Localhost\Service\String\Generator::class)
    ->addArgument('15');

---

Since PHP 5.5+ you can use more fail-proof ::class notation:

$containerBuilder = new ContainerBuilder();
$containerBuilder->register('generator', Localhost\Service\String\Generator::class)
    ->addArgument('15');

Now, when class name will be miss-typed, your IDE will highlight it.

Answer 4

addition :

You should propbably compile the container for performance reasons.

$container = new ContainerBuilder();
$container
    ->register('generator', 'Localhost\Service\String\Generator')
    ->addArgument('15')
;
$container->compile();