我从作曲家那里得到的错误信息是：
您的要求无法解析为可安装的软件包集.
原文链接：https://www.f2er.com/php/130259.html您的要求无法解析为可安装的软件包集.
Problem 1
- Installation request for laravel/framework v5.4.28 -> satisfiable by laravel/framework[v5.4.28].
- laravel/framework v5.4.28 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system.
Problem 2
- Installation request for PHPunit/PHPunit 5.7.21 -> satisfiable by PHPunit/PHPunit[5.7.21].
- PHPunit/PHPunit 5.7.21 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system.
Problem 3
- laravel/framework v5.4.28 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system.
- laravel/tinker v1.0.1 requires illuminate/console ~5.1 -> satisfiable by laravel/framework[v5.4.28].
- Installation request for laravel/tinker v1.0.1 -> satisfiable by laravel/tinker[v1.0.1].
我已经尝试取消注释extension = PHP_mbstring.dll,但它仍然会引发错误.我试图更改“PHP.ini”中的extension_dir,但它给出了一个错误.感谢帮助.
