未安装 Laravel 5.3

Question

我在安装laravel5.3 框架时感到困难，问题是当我用composer create-project --prefer-dist laravel/laravel blog 安装最新版本的composer 时，它会自动安装laravel 5.2 而不是`laravel 5.3

当我将composer.json 文件中的laravel 5.2 更改为laravel 5.3 并运行composer update 时，会出现这样的错误。

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

  Problem 1
    - laravel/framework v5.3.9 requires php >=5.6.4 -> your PHP version (5.6.3) does not satisfy that requirement.
    - laravel/framework v5.3.8 requires php >=5.6.4 -> your PHP version (5.6.3) does not satisfy that requirement.
    - laravel/framework v5.3.7 requires php >=5.6.4 -> your PHP version (5.6.3) does not satisfy that requirement.
    - laravel/framework v5.3.6 requires php >=5.6.4 -> your PHP version (5.6.3) does not satisfy that requirement.
    - laravel/framework v5.3.5 requires php >=5.6.4 -> your PHP version (5.6.3) does not satisfy that requirement.
    - laravel/framework v5.3.4 requires php >=5.6.4 -> your PHP version (5.6.3) does not satisfy that requirement.
    - laravel/framework v5.3.3 requires php >=5.6.4 -> your PHP version (5.6.3) does not satisfy that requirement.
    - laravel/framework v5.3.28 requires php >=5.6.4 -> your PHP version (5.6.3) does not satisfy that requirement.
    - laravel/framework v5.3.27 requires php >=5.6.4 -> your PHP version (5.6.3) does not satisfy that requirement.
    - laravel/framework v5.3.26 requires php >=5.6.4 -> your PHP version (5.6.3) does not satisfy that requirement.
    - laravel/framework v5.3.25 requires php >=5.6.4 -> your PHP version (5.6.3) does not satisfy that requirement.
    - laravel/framework v5.3.24 requires php >=5.6.4 -> your PHP version (5.6.3) does not satisfy that requirement.
    - laravel/framework v5.3.23 requires php >=5.6.4 -> your PHP version (5.6.3) does not satisfy that requirement.
    - laravel/framework v5.3.22 requires php >=5.6.4 -> your PHP version (5.6.3) does not satisfy that requirement.
    - laravel/framework v5.3.21 requires php >=5.6.4 -> your PHP version (5.6.3) does not satisfy that requirement.
    - laravel/framework v5.3.20 requires php >=5.6.4 -> your PHP version (5.6.3) does not satisfy that requirement.
    - laravel/framework v5.3.2 requires php >=5.6.4 -> your PHP version (5.6.3) does not satisfy that requirement.
    - laravel/framework v5.3.19 requires php >=5.6.4 -> your PHP version (5.6.3) does not satisfy that requirement.
    - laravel/framework v5.3.18 requires php >=5.6.4 -> your PHP version (5.6.3) does not satisfy that requirement.
    - laravel/framework v5.3.17 requires php >=5.6.4 -> your PHP version (5.6.3) does not satisfy that requirement.
    - laravel/framework v5.3.16 requires php >=5.6.4 -> your PHP version (5.6.3) does not satisfy that requirement.
    - laravel/framework v5.3.15 requires php >=5.6.4 -> your PHP version (5.6.3) does not satisfy that requirement.
    - laravel/framework v5.3.14 requires php >=5.6.4 -> your PHP version (5.6.3) does not satisfy that requirement.
    - laravel/framework v5.3.13 requires php >=5.6.4 -> your PHP version (5.6.3) does not satisfy that requirement.
    - laravel/framework v5.3.12 requires php >=5.6.4 -> your PHP version (5.6.3) does not satisfy that requirement.
    - laravel/framework v5.3.11 requires php >=5.6.4 -> your PHP version (5.6.3) does not satisfy that requirement.
    - laravel/framework v5.3.10 requires php >=5.6.4 -> your PHP version (5.6.3) does not satisfy that requirement.
    - laravel/framework v5.3.1 requires php >=5.6.4 -> your PHP version (5.6.3) does not satisfy that requirement.
    - laravel/framework v5.3.0 requires php >=5.6.4 -> your PHP version (5.6.3) does not satisfy that requirement.
    - Installation request for laravel/framework 5.3.* -> satisfiable by laravel/framework[v5.3.0, v5.3.1, v5.3.10, v5.3.11, v5.3.12, v5.3.13, v5.3.14, v5.3.15, v5.3.16, v5.3.17, v5.3.18, v5.3.19, v5.3.2, v5.3.20, v5.3.21, v5.3.22, v5.3.23, v5.3.24, v5.3.25, v5.3.26, v5.3.27, v5.3.28, v5.3.3, v5.3.4, v5.3.5, v5.3.6, v5.3.7, v5.3.8, v5.3.9].

但是我有新安装的 xampp，它显示我的 PHP version 是 7.0.13（通过这个 echo 'Current PHP version: ' . phpversion(); 检查） 发生了什么 ？为什么我无法安装 Laravel 5.3？

Answer 1

我认为最好安装一个新的 Laravel 5.3 而不是升级它。工作量更大，但避免了很多问题。

在运行composer create-project --prefer-dist laravel/laravel blog之前，将您的系统配置与laravel 5.3 require configuration进行比较

更新
您可以尝试 composer create-project --prefer-dist laravel/laravel=5.3.* blog 获取特定的 laravel 版本，然后运行 ​​composer update。

Answer 2

首先你应该更新你的 php 版本（使用 7.0），因为 laravel 5.3 通常与 php7.0 一起工作， 然后你应该将 composer.json 中的 laravel 版本从 5.2 更改为 5.3 然后运行 ​​composer update !!!!!! 一切都会好起来的。