使用PHP 7.3版本安装Symfony项目

Question

尝试安装(在更新composer之后)：

composer create-project symfony-cmf/sandbox cmf-sandbox

我有这些错误：

Installing symfony-cmf/sandbox (2.0.0)
  - Installing symfony-cmf/sandbox (2.0.0): Loading from cache
Created project in cmf-sandbox
Loading composer repositories with package information
Installing dependencies (including require-dev) from lock file
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Installation request for phpcr/phpcr-utils 1.3.0 -> satisfiable by phpcr/phpcr-utils[1.3.0].
    - phpcr/phpcr-utils 1.3.0 requires php ^5.6|7.0.x|7.1.x -> your PHP version (7.3.0) does not satisfy that requirement.
  Problem 2
    - phpcr/phpcr-utils 1.3.0 requires php ^5.6|7.0.x|7.1.x -> your PHP version (7.3.0) does not satisfy that requirement.
    - doctrine/phpcr-odm 1.4.2 requires phpcr/phpcr-utils ^1.2.8 -> satisfiable by phpcr/phpcr-utils[1.3.0].
    - Installation request for doctrine/phpcr-odm 1.4.2 -> satisfiable by doctrine/phpcr-odm[1.4.2].

编辑:继续Timo的建议，我能够通过执行以下命令来安装该项目：

composer create-project --ignore-platform-reqs symfony-cmf/sandbox cmf-sandbox

但我得到了以下错误：

PHP Fatal error:  Uncaught Symfony\Component\Debug\Exception\ContextErrorException: Warning: count(): Parameter must be an array or an object that implements Countable in /srv/http/symfony/cmf-sandbox/vendor/symfony-cmf/routing/src/ChainRouter.php:101
Stack trace:
#0 /srv/http/symfony/cmf-sandbox/vendor/symfony-cmf/routing/src/ChainRouter.php(308): Symfony\Cmf\Component\Routing\ChainRouter->all()
#1 /srv/http/symfony/cmf-sandbox/var/cache/dev/appDevDebugProjectContainer.php(1670): Symfony\Cmf\Component\Routing\ChainRouter->setContext(Object(Symfony\Component\Routing\RequestContext))
#2 /srv/http/symfony/cmf-sandbox/vendor/symfony/symfony/src/Symfony/Component/DependencyInjection/Container.php(335): appDevDebugProjectContainer->getCmfRouting_RouterService()
#3 /srv/http/symfony/cmf-sandbox/var/cache/dev/appDevDebugProjectContainer.php(4955): Symfony\Component\DependencyInjection\Container->get('cmf_routing.rou...')
#4 /srv/http/symfony/cmf-sandbox/vendor/symfony/symfony/src/Symfony/Component/DependencyInjection/Container.php(33 in /srv/http/symfony/cmf-sandbox/vendor/symfony-cmf/routing/src/ChainRouter.php on line 101

该项目使用Symfony版本3的结构，可能与PHP 7.3有一些不兼容(正如Timo所说)。

Answer 1

您可以通过在composer create-project命令中添加--ignore-platform-reqs来告诉Composer忽略PHP版本要求。

否则，您可能要等到symfony-cmf/sandbox的依赖项升级到更高版本时才能使用。

编辑:如果Symfony CMF Sandbox的最新版本还不起作用，你可以尝试一下master (最新未发布的更改)，看看它们是否已经在那里得到了解决。您可以通过将--stability=dev添加到composer create-project命令并使用symfony-cmf/sandbox:dev-master作为源代码来完成此操作：composer create-project --ignore-platform-reqs --stability=dev symfony-cmf/sandbox:dev-master cmf-sandbox