Implement NullContainer

Author: e1himself

.gitignore

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+/vendor/
+composer.lock

composer.json

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+{
+    "name": "technically-php/null-container",
+    "description": "Null (always empty) PSR-11 container implementation",
+    "type": "library",
+    "require": {
+        "php": ">=7.0",
+        "psr/container": "^1.0"
+    },
+    "license": "MIT",
+    "authors": [
+        {
+            "name": "Ivan Voskoboinyk",
+            "email": "ivan@voskoboinyk.com"
+        }
+    ],
+    "minimum-stability": "stable",
+    "autoload": {
+        "psr-4": {
+            "Technically\\NullContainer\\": "src"
+        }
+    }
+}

src/Exceptions/ServiceNotFound.php

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+<?php
+
+namespace Technically\NullContainer\Exceptions;
+
+use Psr\Container\NotFoundExceptionInterface;
+use RuntimeException;
+
+final class ServiceNotFound extends RuntimeException implements NotFoundExceptionInterface
+{
+    /**
+     * @var string
+     */
+    private $serviceName;
+
+    /**
+     * @param string $serviceName
+     */
+    public function __construct(string $serviceName)
+    {
+        $this->serviceName = $serviceName;
+
+        parent::__construct("Could not resolve service (`{$serviceName}`).");
+    }
+
+    /**
+     * @return string
+     */
+    public function getServiceName(): string
+    {
+        return $this->serviceName;
+    }
+}

src/NullContainer.php

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+<?php
+
+namespace Technically\NullContainer;
+
+use Psr\Container\ContainerInterface;
+use Technically\NullContainer\Exceptions\ServiceNotFound;
+
+final class NullContainer implements ContainerInterface
+{
+    /**
+     * Get an entry of the container by its identifier.
+     *
+     * Always throws `ServiceNotFound` exception.
+     *
+     * @param string $id Identifier of the entry to look for.
+     * @throws ServiceNotFound Always
+     */
+    public function get($id)
+    {
+        throw new ServiceNotFound($id);
+    }
+
+    /**
+     * Check if the container can return an entry for the given identifier
+     *
+     * Always returns false.
+     *
+     * @param string $id
+     * @return false
+     */
+    public function has($id)
+    {
+        return false;
+    }
+}