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我正在尝试将项目从旧服务器移到新服务器上。不同版本的PHP。当我安装作曲家时遇到麻烦......这是composer.json

{
    "name": "symfony/framework-standard-edition",
    "license": "MIT",
    "type": "project",
    "description": "The \"Symfony Standard Edition\" distribution",
    "autoload": {
        "psr-0": {
            "Mda\\": "src/",
            "SymfonyStandard": "app/"
        },
        "files": [
            "app/AppKernel.php"
        ]
    },
    "require": {
        "php": ">=5.6",
        "symfony/symfony": "3.4.*",
        "doctrine/orm": "~2.5",
        "doctrine/doctrine-bundle": "~1.5",
        "twig/extensions": "~1.2",
        "symfony/assetic-bundle": "~2.7",
        "symfony/swiftmailer-bundle": "~2.3",
        "symfony/monolog-bundle": "~3.2.0",
        "sensio/distribution-bundle": "~5.0",
        "sensio/framework-extra-bundle": "~3.0",
        "incenteev/composer-parameter-handler": "~2.1",
        "friendsofsymfony/user-bundle": "~2.0",
        "friendsofsymfony/jsrouting-bundle": "~1.5",
        "knplabs/knp-snappy-bundle": "1.4.*",
        "zendframework/zend-code": "~3.4",
        "guzzlehttp/guzzle": "~6.2",
        "itbz/fpdf": "1.7.2",
        "stfalcon/tinymce-bundle": "~2.0",
        "webnet/swissarmy-bundle": "1.0.x-dev",
        "friendsofsymfony/rest-bundle": "2.0.x-dev",
        "jms/serializer-bundle": "^2.4.2",
        "mikehaertl/php-pdftk": "^0.4.4",
        "beberlei/doctrineextensions": "^1.0",
        "doctrine/doctrine-migrations-bundle": "^1.0"
    },
    "require-dev": {
        "sensio/generator-bundle": "~3.1"
    },
    "scripts": {
        "post-root-package-install": [
            "SymfonyStandard\\Composer::hookRootPackageInstall"
        ],
        "post-install-cmd": [
            "Incenteev\\ParameterHandler\\ScriptHandler::buildParameters",
            "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::buildBootstrap",
            "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::clearCache",
            "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installAssets",
            "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installRequirementsFile",
            "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::removeSymfonyStandardFiles"
        ],
        "post-update-cmd": [
            "Incenteev\\ParameterHandler\\ScriptHandler::buildParameters",
            "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::buildBootstrap",
            "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::clearCache",
            "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installAssets",
            "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installRequirementsFile",
            "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::removeSymfonyStandardFiles"
        ]
    },
    "config": {
        "secure-http": false
    },
    "extra": {
        "symfony-app-dir": "app",
        "symfony-web-dir": "web",
        "symfony-var-dir": "var",
        "symfony-bin-dir": "bin",
        "symfony-assets-install": "relative",
        "incenteev-parameters": {
            "file": "app/config/parameters.yml"
        },
        "branch-alias": {
            "dev-master": "2.6-dev"
        }
    },
    "repositories": [
        {
            "type": "svn",
            "url": "https://bellatrix.webnet.fr/WebnetSwissArmyBundle"
        }
    ]
}

错误是

PHP Fatal error:  Could not check compatibility between Symfony\Bridge\ProxyManager\LazyProxy\PhpDumper\LazyLoadingValueHolderGenerator::generate(ReflectionClass $originalClass,
   Zend\Code\Generator\ClassGenerator $classGenerator) and ProxyManager\ProxyGenerator\LazyLoadingValueHolderGenerator::generate(ReflectionClass $originalClass, Laminas\Code\Gener
  ator\ClassGenerator $classGenerator), because class Zend\Code\Generator\ClassGenerator is not available in /var/www/mda/vendor/symfony/symfony/src/Symfony/Bridge/ProxyManager/La
  zyProxy/PhpDumper/LazyLoadingValueHolderGenerator.php on line 25

  In LazyLoadingValueHolderGenerator.php line 25:
    Compile Error: Could not check compatibility between Symfony\Bridge\ProxyMa
    nager\LazyProxy\PhpDumper\LazyLoadingValueHolderGenerator::generate(Reflect
    ionClass $originalClass, Zend\Code\Generator\ClassGenerator $classGenerator
    ) and ProxyManager\ProxyGenerator\LazyLoadingValueHolderGenerator::generate
    (ReflectionClass $originalClass, Laminas\Code\Generator\ClassGenerator $cla
    ssGenerator), because class Zend\Code\Generator\ClassGenerator is not avail
    able

你有什么想法吗？谢谢

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