Installing Symfony project with PHP 7.3 version

参考地址：https://cmsdk.com/php/installing-symfony-project-with-php-7-3-version.html

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Tryng to install (and after updating composer):

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

I have those errors:

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].

Edit: Continuing the recommendation of Timo,I was able to install the project by executing the following:

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

but I have obtained the following errors:

PHP Fatal error: Uncaught SymfonyComponentDebugExceptionContextErrorException: 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): SymfonyCmfComponentRoutingChainRouter->all() #1 /srv/http/symfony/cmf-sandbox/var/cache/dev/appDevDebugProjectContainer.php(1670): SymfonyCmfComponentRoutingChainRouter->setContext(Object(SymfonyComponentRoutingRequestContext)) #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): SymfonyComponentDependencyInjectionContainer->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

The project uses a Symfony version 3 structure and may have some incompatibility with PHP 7.3 (as Timo says).