Composer 不检测 php7，而是使用 5.6。如何设置 CLI 以使用 php7

当我执行时在这里php -v，它说它有 php7

但是当我尝试执行时composer update

回应它

Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - This package requires php >=7.0.0 but your PHP version (5.6.33) does not satisfy that requirement.

我怎样才能解决这个问题？ 注意：我不允许卸载以前版本的 php

这是composer.json

{
    "name": "laravel/laravel",
    "description": "The Laravel Framework.",
    "keywords": ["framework", "laravel"],
    "license": "MIT",
    "type": "project",
    "require": {
        "php": ">=7.0.0",
        "fideloper/proxy": "~3.3",
        "intervention/image": "^2.4",
        "laravel/framework": "5.5.*",
        "laravel/passport": "^v1",
        "laravel/tinker": "~1.0"
    },
    "require-dev": {
        "filp/whoops": "~2.0",
        "fzaninotto/faker": "~1.4",
        "mockery/mockery": "0.9.*",
        "phpunit/phpunit": "~6.0"
    },
    "autoload": {
        "classmap": [
            "database/seeds",
            "database/factories"
        ],
        "psr-4": {
            "App\\": "app/"
        },
        "files": [
            "app/Helpers/misc.php"
        ]
    },
    "autoload-dev": {
        "psr-4": {
            "Tests\\": "tests/"
        }
    },
    "extra": {
        "laravel": {
            "dont-discover": [
            ]
        }
    },
    "scripts": {
        "post-root-package-install": [
            "@php -r \"file_exists('.env') || copy('.env.example', '.env');\""
        ],
        "post-create-project-cmd": [
            "@php artisan key:generate"
        ],
        "post-autoload-dump": [
            "Illuminate\\Foundation\\ComposerScripts::postAutoloadDump",
            "@php artisan package:discover"
        ]
    },
    "config": {
        "preferred-install": "dist",
        "sort-packages": true,
        "optimize-autoloader": true
    }
}

我已经尝试过了

composer update --ignore-platform-reqs

但我仍然收到另一个错误，该错误再次与上述问题相关。

正如问题中所述，您的系统上已经有两个版本的 PHP，由于 Laravel 使用 cli 版本，您需要启用 7.X 并禁用 5.X。

您可以通过以下命令来实现

$ sudo a2dismod php5.6 // disable the loaded version
$ sudo a2enmod php7.0 // enable the desired version
$ sudo service apache2 restart // restart apache to get it in action

了解更多信息 您可以使用以下命令安装不同版本的 PHP

对于阿帕奇

$ sudo apt install php5.6   [PHP 5.6]
$ sudo apt install php7.0   [PHP 7.0]
$ sudo apt install php7.1   [PHP 7.1]

For Ngix

$ sudo apt install php5.6-fpm   [PHP 5.6]
$ sudo apt install php7.0-fpm   [PHP 7.0]
$ sudo apt install php7.1-fpm   [PHP 7.1]

要安装任何 PHP 模块，只需指定 PHP 版本并使用自动完成功能即可查看所有模块，如下所示。

------------ press Tab key for auto-completion ------------ 
$ sudo apt install php5.6 
$ sudo apt install php7.0 
$ sudo apt install php7.1 

现在您可以根据您的要求安装大多数必需的 PHP 模块。

------------ Install PHP Modules ------------
$ sudo apt install php5.6-cli php5.6-xml php5.6-mysql 
$ sudo apt install php7.0-cli php7.0-xml php7.0-mysql 
$ sudo apt install php7.1-cli php7.1-xml php7.1-mysql