Cannot update Laravel 5.4 to 5.5 composer

问题

When I tried to update Laravel 5.5 from 5.4, it is show errors.

{
    "name": "laravel/laravel",
    "description": "The Laravel Framework.",
    "keywords": ["framework", "laravel"],
    "license": "MIT",
    "type": "project",
    "require": {
        "php": ">=7.0",
        "intervention/image": "^2.4",
        "laravel/framework": "5.5.*",
        "laravel/tinker": "~1.0"
    },
    "require-dev": {
        "fzaninotto/faker": "~1.4",
        "mockery/mockery": "0.9.*",
        "phpunit/phpunit": "~6.0"
    },
    "autoload": {
        "classmap": [
            "database"
        ],
        "psr-4": {
            "App\\": "app/"
        }
    },
    "autoload-dev": {
        "psr-4": {
            "Tests\\": "tests/"
        }
    },
    "scripts": {
        "post-root-package-install": [
            "php -r \"file_exists('.env') || copy('.env.example', '.env');\""
        ],
        "post-create-project-cmd": [
            "php artisan key:generate"
        ],
        "post-install-cmd": [
            "Illuminate\\Foundation\\ComposerScripts::postInstall",
            "php artisan optimize"
        ],
        "post-update-cmd": [
            "Illuminate\\Foundation\\ComposerScripts::postUpdate",
            "php artisan optimize"
        ]
    },
    "config": {
        "preferred-install": "dist",
        "sort-packages": true,
        "optimize-autoloader": true
    }
}

This is my composer.json file. When I use command composer update, this is show.

Problem 1
        - This package requires php >=7.0 but your PHP version (5.6.25) does not satisfy that requirement.
      Problem 2
        - Installation request for laravel/framework 5.5.* -> satisfiable by laravel/framework[v5.5.0].
        - laravel/framework v5.5.0 requires php >=7.0 -> your PHP version (5.6.25) does not satisfy that requirement.
      Problem 3
        - phpunit/phpunit 6.3.0 requires php ^7.0 -> your PHP version (5.6.25) does not satisfy that requirement.
        - phpunit/phpunit 6.2.4 requires php ^7.0 -> your PHP version (5.6.25) does not satisfy that requirement.
        - phpunit/phpunit 6.2.3 requires php ^7.0 -> your PHP version (5.6.25) does not satisfy that requirement.
        - phpunit/phpunit 6.2.2 requires php ^7.0 -> your PHP version (5.6.25) does not satisfy that requirement.
        - phpunit/phpunit 6.2.1 requires php ^7.0 -> your PHP version (5.6.25) does not satisfy that requirement.
        - phpunit/phpunit 6.2.0 requires php ^7.0 -> your PHP version (5.6.25) does not satisfy that requirement.
        - phpunit/phpunit 6.1.4 requires php ^7.0 -> your PHP version (5.6.25) does not satisfy that requirement.
        - phpunit/phpunit 6.1.3 requires php ^7.0 -> your PHP version (5.6.25) does not satisfy that requirement.
        - phpunit/phpunit 6.1.2 requires php ^7.0 -> your PHP version (5.6.25) does not satisfy that requirement.
        - phpunit/phpunit 6.1.1 requires php ^7.0 -> your PHP version (5.6.25) does not satisfy that requirement.
        - phpunit/phpunit 6.1.0 requires php ^7.0 -> your PHP version (5.6.25) does not satisfy that requirement.
        - phpunit/phpunit 6.0.9 requires php ^7.0 -> your PHP version (5.6.25) does not satisfy that requirement.
        - phpunit/phpunit 6.0.8 requires php ^7.0 -> your PHP version (5.6.25) does not satisfy that requirement.
        - phpunit/phpunit 6.0.7 requires php ^7.0 -> your PHP version (5.6.25) does not satisfy that requirement.
        - phpunit/phpunit 6.0.6 requires php ^7.0 -> your PHP version (5.6.25) does not satisfy that requirement.
        - phpunit/phpunit 6.0.5 requires php ^7.0 -> your PHP version (5.6.25) does not satisfy that requirement.
        - phpunit/phpunit 6.0.4 requires php ^7.0 -> your PHP version (5.6.25) does not satisfy that requirement.
        - phpunit/phpunit 6.0.3 requires php ^7.0 -> your PHP version (5.6.25) does not satisfy that requirement.
        - phpunit/phpunit 6.0.2 requires php ^7.0 -> your PHP version (5.6.25) does not satisfy that requirement.
        - phpunit/phpunit 6.0.13 requires php ^7.0 -> your PHP version (5.6.25) does not satisfy that requirement.
        - phpunit/phpunit 6.0.12 requires php ^7.0 -> your PHP version (5.6.25) does not satisfy that requirement.
        - phpunit/phpunit 6.0.11 requires php ^7.0 -> your PHP version (5.6.25) does not satisfy that requirement.
        - phpunit/phpunit 6.0.10 requires php ^7.0 -> your PHP version (5.6.25) does not satisfy that requirement.
        - phpunit/phpunit 6.0.1 requires php ^7.0 -> your PHP version (5.6.25) does not satisfy that requirement.
        - phpunit/phpunit 6.0.0 requires php ^7.0 -> your PHP version (5.6.25) does not satisfy that requirement.
        - Installation request for phpunit/phpunit ~6.0 -> satisfiable by phpunit/phpunit[6.0.0, 6.0.1, 6.0.10, 6.0.11, 6.0.12, 6.0.13, 6.0.
    2, 6.0.3, 6.0.4, 6.0.5, 6.0.6, 6.0.7, 6.0.8, 6.0.9, 6.1.0, 6.1.1, 6.1.2, 6.1.3, 6.1.4, 6.2.0, 6.2.1, 6.2.2, 6.2.3, 6.2.4, 6.3.0].

My PHP version is 7.0.10 and I use wamp.

回答1:

Your PHP version is 5.6

This package requires php >=7.0 but your PHP version (5.6.25) does not satisfy that requirement.

So change your PHP version to PHP 7.0 and run:

composer install

回答2:

i had similar issue in the past.. this happens with wamp.. check your php version using command prompt.. sometimes wamp shows v7 but the project keeps using older version in the background. or create a route on laravel to show php version.. it will confirm what the issue is.