мой Engli sh очень плох, у меня проблема при установке проекта symfony4.4 на сервере centos7, с php7 .3, а не php7 .4 в windows в порядке с php7. 3 Я запускаю командную строку
/ opt / plesk / php / 7.3 / bin / php /usr/lib64/plesk-9.0/composer.phar install
У меня есть это результат 
и это мой composer. json
{
"type": "project",
"license": "proprietary",
"require": {
"php": "^7.1.3",
"ext-ctype": "*",
"ext-iconv": "*",
"ext-json": "*",
"api-platform/api-pack": "^1.2",
"doctrine/doctrine-fixtures-bundle": "^3.3",
"friendsofsymfony/rest-bundle": "^2.7",
"knplabs/knp-snappy-bundle": "^1.7",
"lexik/jwt-authentication-bundle": "^2.6",
"nelmio/api-doc-bundle": "^3.5",
"symfony/console": "4.4.*",
"symfony/dotenv": "4.4.*",
"symfony/flex": "^1.3.1",
"symfony/form": "4.4.*",
"symfony/framework-bundle": "4.4.*",
"symfony/http-client": "4.4.*",
"symfony/orm-pack": "^1.0",
"symfony/serializer": "4.4.*",
"symfony/swiftmailer-bundle": "^3.4",
"symfony/translation": "4.4.*",
"symfony/validator": "4.4.*",
"symfony/yaml": "4.4.*",
"vich/uploader-bundle": "^1.13"
},
"require-dev": {
"ocramius/proxy-manager": "2.2.3",
"symfony/maker-bundle": "^1.14",
"symfony/profiler-pack": "^1.0",
"symfony/web-server-bundle": "4.4.*"
},
"config": {
"preferred-install": {
"*": "dist"
},
"sort-packages": true
},
"autoload": {
"psr-4": {
"App\\": "src/"
}
},
"replace": {
"paragonie/random_compat": "2.*",
"symfony/polyfill-ctype": "*",
"symfony/polyfill-iconv": "*",
"symfony/polyfill-php71": "*",
"symfony/polyfill-php70": "*",
"symfony/polyfill-php56": "*"
},
"scripts": {
"auto-scripts": {
"cache:clear": "symfony-cmd",
"assets:install %PUBLIC_DIR%": "symfony-cmd"
},
"post-install-cmd": [
"@auto-scripts"
],
"post-update-cmd": [
"@auto-scripts"
]
},
"conflict": {
"symfony/symfony": "*"
},
"extra": {
"symfony": {
"allow-contrib": false,
"require": "4.4.*"
}
}
}