php artisan serve -- 抛出错误

Question

所以我今天才开始学习 Laravel，并安装了 Composer 和 Laravel

我使用以下方法创建了一个新应用程序：-

laravel new application

在我的文件夹中：-

/Library/WebServer/Documents/

但是，当我尝试运行时：-

php artisan serve

我收到此错误：-

Warning: require(/Library/WebServer/Documents/application/bootstrap/../vendor/autoload.php): failed to open stream: No such file or directory in /Library/WebServer/Documents/application/bootstrap/autoload.php on line 17

Fatal error: require(): Failed opening required '/Library/WebServer/Documents/application/bootstrap/../vendor/autoload.php' (include_path='.:') in /Library/WebServer/Documents/application/bootstrap/autoload.php on line 17

我已经尝试更新我的作曲家，但没有奏效。 我在这里做错了什么？

编辑

运行 composer install 给出了这个：-

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

  Problem 1
    - This package requires php >=5.6.4 but your PHP version (5.5.34) does not satisfy that requirement.
  Problem 2
    - Installation request for laravel/framework v5.4.24 -> satisfiable by laravel/framework[v5.4.24].
    - laravel/framework v5.4.24 requires php >=5.6.4 -> your PHP version (5.5.34) does not satisfy that requirement.
  Problem 3
    - Installation request for phpunit/php-code-coverage 4.0.8 -> satisfiable by phpunit/php-code-coverage[4.0.8].
    - phpunit/php-code-coverage 4.0.8 requires php ^5.6 || ^7.0 -> your PHP version (5.5.34) does not satisfy that requirement.
  Problem 4
    - Installation request for phpunit/phpunit 5.7.20 -> satisfiable by phpunit/phpunit[5.7.20].
    - phpunit/phpunit 5.7.20 requires php ^5.6 || ^7.0 -> your PHP version (5.5.34) does not satisfy that requirement.
  Problem 5
    - Installation request for phpunit/phpunit-mock-objects 3.4.3 -> satisfiable by phpunit/phpunit-mock-objects[3.4.3].
    - phpunit/phpunit-mock-objects 3.4.3 requires php ^5.6 || ^7.0 -> your PHP version (5.5.34) does not satisfy that requirement.
  Problem 6
    - Installation request for sebastian/code-unit-reverse-lookup 1.0.1 -> satisfiable by sebastian/code-unit-reverse-lookup[1.0.1].
    - sebastian/code-unit-reverse-lookup 1.0.1 requires php ^5.6 || ^7.0 -> your PHP version (5.5.34) does not satisfy that requirement.
  Problem 7
    - Installation request for sebastian/environment 2.0.0 -> satisfiable by sebastian/environment[2.0.0].
    - sebastian/environment 2.0.0 requires php ^5.6 || ^7.0 -> your PHP version (5.5.34) does not satisfy that requirement.
  Problem 8
    - Installation request for sebastian/object-enumerator 2.0.1 -> satisfiable by sebastian/object-enumerator[2.0.1].
    - sebastian/object-enumerator 2.0.1 requires php >=5.6 -> your PHP version (5.5.34) does not satisfy that requirement.
  Problem 9
    - Installation request for sebastian/resource-operations 1.0.0 -> satisfiable by sebastian/resource-operations[1.0.0].
    - sebastian/resource-operations 1.0.0 requires php >=5.6.0 -> your PHP version (5.5.34) does not satisfy that requirement.
  Problem 10
    - Installation request for sebastian/version 2.0.1 -> satisfiable by sebastian/version[2.0.1].
    - sebastian/version 2.0.1 requires php >=5.6 -> your PHP version (5.5.34) does not satisfy that requirement.
  Problem 11
    - laravel/framework v5.4.24 requires php >=5.6.4 -> your PHP version (5.5.34) does not satisfy that requirement.
    - laravel/tinker v1.0.1 requires illuminate/console ~5.1 -> satisfiable by laravel/framework[v5.4.24].
    - Installation request for laravel/tinker v1.0.1 -> satisfiable by laravel/tinker[v1.0.1].

Answer 1

注意：您使用的是 laravel 5.4，它需要 php 5.6（最低），要么将您的 php 更新到 5.6，要么使用 laravel 5.2，这就是原因 使用此命令安装 laravel 5.2

composer create-project --prefer-dist laravel/laravel your_project_name "5.2.*"

转到命令提示符（在 Windows 中）

设置 www/{ur project} 的路径

对我来说：www/laravel5

然后输入这个命令：composer install

它会自动在 vendor/ 中安装所有依赖项

Answer 2

您必须使用composer install 安装项目的供应商依赖项：

# go to the app root folder
cd /Library/WebServer/Documents/application/
# install vendor dependecies
composer install

编辑

在您编辑问题后，错误消息清楚地表明您的旧 php 版本无法运行新的 laravel 应用程序。你有两个选择：

将你的 php 升级到 php 5.6.25（最好是 php7）

降级你的应用（到 laravel 5.2.*，下面的脚本会删除它并安装一个新的

# go to the app root folder
cd /Library/WebServer/Documents/
rm -rf application
# install vendor dependecies
composer create-project --prefer-dist laravel/laravel application 5.2.*