Update to Symfony 4

.env.dist

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+# This file is a "template" of which env vars need to be defined for your application
+# Copy this file to .env file for development, create environment variables when deploying to production
+# https://symfony.com/doc/current/best_practices/configuration.html#infrastructure-related-configuration
+
+###> symfony/framework-bundle ###
+APP_ENV=dev
+APP_SECRET=384b043b67a4f1431eef6b2f6e50b2cb
+#TRUSTED_PROXIES=127.0.0.1,127.0.0.2
+#TRUSTED_HOSTS=localhost,example.com
+###< symfony/framework-bundle ###
+
+###> symfony/swiftmailer-bundle ###
+# For Gmail as a transport, use: "gmail://username:password@localhost"
+# For a generic SMTP server, use: "smtp://localhost:25?encryption=&auth_mode="
+# Delivery is disabled by default via "null://localhost"
+MAILER_URL=null://localhost
+###< symfony/swiftmailer-bundle ###
+
+###> doctrine/doctrine-bundle ###
+# Format described at http://docs.doctrine-project.org/projects/doctrine-dbal/en/latest/reference/configuration.html#connecting-using-a-url
+# For an SQLite database, use: "sqlite:///%kernel.project_dir%/var/data.db"
+# Configure your db driver and server_version in config/packages/doctrine.yaml
+DATABASE_URL=mysql://db_user:db_password@127.0.0.1:3306/db_name
+###< doctrine/doctrine-bundle ###

.gitignore

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+
+###> symfony/framework-bundle ###
+.env
+/public/bundles/
+/var/
+/vendor/
+###< symfony/framework-bundle ###
+
+###> symfony/webpack-encore-pack ###
+/node_modules/
+/public/build/
+###< symfony/webpack-encore-pack ###
+
+###> symfony/phpunit-bridge ###
+.phpunit
+/phpunit.xml
+###< symfony/phpunit-bridge ###
+
+###> symfony/web-server-bundle ###
+.web-server-pid
+###< symfony/web-server-bundle ###

README.md

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+# sample-php-symfony
+
+## Dev environment
+
+Install and run a web server with:
+
+```sh
+composer require server --dev
+php bin/console server:run
+```
+
+Then the website is available at `http://localhost:8000/`.

bin/console

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+#!/usr/bin/env php
+<?php
+
+use App\Kernel;
+use Symfony\Bundle\FrameworkBundle\Console\Application;
+use Symfony\Component\Console\Input\ArgvInput;
+use Symfony\Component\Debug\Debug;
+use Symfony\Component\Dotenv\Dotenv;
+
+set_time_limit(0);
+
+require __DIR__.'/../vendor/autoload.php';
+
+if (!class_exists(Application::class)) {
+    throw new \RuntimeException('You need to add "symfony/framework-bundle" as a Composer dependency.');
+}
+
+if (!isset($_SERVER['APP_ENV'])) {
+    if (!class_exists(Dotenv::class)) {
+        throw new \RuntimeException('APP_ENV environment variable is not defined. You need to define environment variables for configuration or add "symfony/dotenv" as a Composer dependency to load variables from a .env file.');
+    }
+    (new Dotenv())->load(__DIR__.'/../.env');
+}
+
+$input = new ArgvInput();
+$env = $input->getParameterOption(['--env', '-e'], $_SERVER['APP_ENV'] ?? 'dev', true);
+$debug = ($_SERVER['APP_DEBUG'] ?? ('prod' !== $env)) && !$input->hasParameterOption('--no-debug', true);
+
+if ($debug) {
+    umask(0000);
+
+    if (class_exists(Debug::class)) {
+        Debug::enable();
+    }
+}
+
+$kernel = new Kernel($env, $debug);
+$application = new Application($kernel);
+$application->run($input);

bin/phpunit

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+#!/usr/bin/env php
+<?php
+
+if (!file_exists(dirname(__DIR__).'/vendor/symfony/phpunit-bridge/bin/simple-phpunit')) {
+    echo "Unable to find the `simple-phpunit` script in `vendor/symfony/phpunit-bridge/bin/`.\n";
+    exit(1);
+}
+if (false === getenv('SYMFONY_PHPUNIT_REMOVE')) {
+    putenv('SYMFONY_PHPUNIT_REMOVE=symfony/yaml');
+}
+if (false === getenv('SYMFONY_PHPUNIT_VERSION')) {
+    putenv('SYMFONY_PHPUNIT_VERSION=6.5');
+}
+if (false === getenv('SYMFONY_PHPUNIT_DIR')) {
+    putenv('SYMFONY_PHPUNIT_DIR='.__DIR__.'/.phpunit');
+}
+
+require dirname(__DIR__).'/vendor/symfony/phpunit-bridge/bin/simple-phpunit';

composer.json

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+{
+    "type": "project",
+    "license": "proprietary",
+    "require": {
+        "php": "^7.1.3",
+        "ext-iconv": "*",
+        "sensio/framework-extra-bundle": "^5.1",
+        "symfony/asset": "^4.0",
+        "symfony/console": "^4.0",
+        "symfony/debug-pack": "*",
+        "symfony/expression-language": "^4.0",
+        "symfony/flex": "^1.0",
+        "symfony/form": "^4.0",
+        "symfony/framework-bundle": "^4.0",
+        "symfony/lts": "^4@dev",
+        "symfony/monolog-bundle": "^3.1",
+        "symfony/orm-pack": "*",
+        "symfony/process": "^4.0",
+        "symfony/security-bundle": "^4.0",
+        "symfony/serializer-pack": "*",
+        "symfony/swiftmailer-bundle": "^3.1",
+        "symfony/twig-bundle": "^4.0",
+        "symfony/validator": "^4.0",
+        "symfony/web-link": "^4.0",
+        "symfony/webpack-encore-pack": "*",
+        "symfony/yaml": "^4.0"
+    },
+    "require-dev": {
+        "symfony/browser-kit": "^4.0",
+        "symfony/css-selector": "^4.0",
+        "symfony/dotenv": "^4.0",
+        "symfony/maker-bundle": "^1.0",
+        "symfony/phpunit-bridge": "^4.0",
+        "symfony/profiler-pack": "*",
+        "symfony/web-server-bundle": "^4.0"
+    },
+    "config": {
+        "preferred-install": {
+            "*": "dist"
+        },
+        "sort-packages": true
+    },
+    "autoload": {
+        "psr-4": {
+            "App\\": "src/"
+        }
+    },
+    "autoload-dev": {
+        "psr-4": {
+            "App\\Tests\\": "tests/"
+        }
+    },
+    "replace": {
+        "symfony/polyfill-iconv": "*",
+        "symfony/polyfill-php71": "*",
+        "symfony/polyfill-php70": "*",
+        "symfony/polyfill-php56": "*"
+    },
+    "scripts": {
+        "auto-scripts": {
+            "cache:clear": "symfony-cmd",
+            "assets:install --symlink --relative %PUBLIC_DIR%": "symfony-cmd"
+        },
+        "post-install-cmd": [
+            "@auto-scripts"
+        ],
+        "post-update-cmd": [
+            "@auto-scripts"
+        ]
+    },
+    "conflict": {
+        "symfony/symfony": "*"
+    },
+    "extra": {
+        "symfony": {
+            "id": "01C857G7E8W88B2733RR503DH6",
+            "allow-contrib": false
+        }
+    }
+}