这是 Symfony 3.4 项目中 composer.json 文件的 require 部分
"require": {
"php": ">=5.5.9",
"doctrine/doctrine-bundle": "^1.6",
"doctrine/orm": "^2.5",
"friendsofsymfony/rest-bundle": "^2.3",
"incenteev/composer-parameter-handler": "^2.0",
"jms/serializer-bundle": "^2.3",
"nelmio/api-doc-bundle": "^2.12",
"sensio/distribution-bundle": "^5.0.19",
"sensio/framework-extra-bundle": "^5.0.0",
"symfony/monolog-bundle": "^3.1.0",
"symfony/polyfill-apcu": "^1.0",
"symfony/swiftmailer-bundle": "^2.6.4",
"symfony/symfony": "3.4.*",
"symfony/templating": "^4.0",
"twig/twig": "^1.0||^2.0"