Composer install Laravel：您的需求无法解析为一组可安装的软件包答案

【问题标题】：Composer install Laravel: Your requirements could not be resolved to an installable set of packagesComposer install Laravel：您的需求无法解析为一组可安装的软件包
【发布时间】：2018-10-22 11:11:47
【问题描述】：

我第一次尝试使用 composer 安装 Laravel。

按照https://laravel.com/docs/5.1 上的文档，我尝试使用命令sudo composer global require "laravel/installer" 进行操作。

我得到的输出粘贴在下面：

Changed current directory to /home/israel/.composer
Using version ^2.0 for laravel/installer
./composer.json has been created
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - laravel/installer v2.0.1 requires ext-zip * -> the requested PHP extension zip is missing from your system.
    - laravel/installer v2.0.0 requires ext-zip * -> the requested PHP extension zip is missing from your system.
    - Installation request for laravel/installer ^2.0 -> satisfiable by laravel/installer[v2.0.0, v2.0.1].

  To enable extensions, verify that they are enabled in those .ini files:
    - /etc/php/7.2/cli/php.ini
    - /etc/php/7.2/cli/conf.d/10-opcache.ini
    - /etc/php/7.2/cli/conf.d/10-pdo.ini
    - /etc/php/7.2/cli/conf.d/15-xml.ini
    - /etc/php/7.2/cli/conf.d/20-calendar.ini
    - /etc/php/7.2/cli/conf.d/20-ctype.ini
    - /etc/php/7.2/cli/conf.d/20-curl.ini
    - /etc/php/7.2/cli/conf.d/20-dom.ini
    - /etc/php/7.2/cli/conf.d/20-exif.ini
    - /etc/php/7.2/cli/conf.d/20-fileinfo.ini
    - /etc/php/7.2/cli/conf.d/20-ftp.ini
    - /etc/php/7.2/cli/conf.d/20-gettext.ini
    - /etc/php/7.2/cli/conf.d/20-iconv.ini
    - /etc/php/7.2/cli/conf.d/20-json.ini
    - /etc/php/7.2/cli/conf.d/20-mbstring.ini
    - /etc/php/7.2/cli/conf.d/20-phar.ini
    - /etc/php/7.2/cli/conf.d/20-posix.ini
    - /etc/php/7.2/cli/conf.d/20-readline.ini
    - /etc/php/7.2/cli/conf.d/20-shmop.ini
    - /etc/php/7.2/cli/conf.d/20-simplexml.ini
    - /etc/php/7.2/cli/conf.d/20-sockets.ini
    - /etc/php/7.2/cli/conf.d/20-sysvmsg.ini
    - /etc/php/7.2/cli/conf.d/20-sysvsem.ini
    - /etc/php/7.2/cli/conf.d/20-sysvshm.ini
    - /etc/php/7.2/cli/conf.d/20-tokenizer.ini
    - /etc/php/7.2/cli/conf.d/20-wddx.ini
    - /etc/php/7.2/cli/conf.d/20-xmlreader.ini
    - /etc/php/7.2/cli/conf.d/20-xmlwriter.ini
    - /etc/php/7.2/cli/conf.d/20-xsl.ini
  You can also run `php --ini` inside terminal to see which files are used by PHP in CLI mode.

Installation failed, deleting ./composer.json.

这是否意味着没有安装 PHP？

【问题讨论】：

安装ext-zip 以及任何其他丢失的包。

标签： php laravel composer-php php-7.2

【解决方案1】：

只需运行sudo apt-get install php7.2-zip && sudo apt-get install php-zip。之后，您将再次运行命令 (sudo composer global require "laravel/installer")。

它应该可以正常工作。

确实如此。 :)

【讨论】：

【解决方案2】：

如果你尝试

sudo apt-get install php7.2-zip

你遇到了错误：

sudo: apt-get: command not found

然后，改用自制软件试试：

brew install php

这对我有用。希望它可以为人们节省几分钟额外的头疼:) 快乐编码！

【讨论】：

是的。我建议 Mac 用户使用brew install ...。我不确定，但我认为 apt-get 适用于所有 Linux [Ubuntu] 用户。
有可能！至少对我来说，它不是，我需要找到另一个解决方案。所以，brew 工作得很好:)

【解决方案3】：

看看 Laravel 的要求：

PHP >= 7.1.3
OpenSSL PHP Extension
PDO PHP Extension
Mbstring PHP Extension
Tokenizer PHP Extension
XML PHP Extension
Ctype PHP Extension
JSON PHP Extension

你认识他们吗？您的错误消息指出，您的环境不符合 PHP 版本和扩展，因此您必须先安装它们。一旦你安装了正确的 PHP 版本和相应的扩展，composer 将能够根据需要安装 laravel。

希望这会有所帮助！ :)

【讨论】：