当我在CakePHP3内运行composer install时，我得到扩展丢失错误 - When I run composer install inside CakePHP3 I get extension missing errors

When I run composer install inside CakePHP3 I get extension missing errors

当我在CakePHP3项目中运行composer install时，我得到以下错误:

  Problem 1
    - Installation request for cakephp/cakephp 3.2.12 -> satisfiable by cakephp/cakephp[3.2.12].
    - cakephp/cakephp 3.2.12 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system.
  Problem 2
    - cakephp/cakephp 3.2.12 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system.
    - cakephp/debug_kit 3.2.9 requires cakephp/cakephp >=3.1.0 <4.0 -> satisfiable by cakephp/cakephp[3.2.12].
    - Installation request for cakephp/debug_kit 3.2.9 -> satisfiable by cakephp/debug_kit[3.2.9].

我使用的是Ubuntu 16.04(注意PHP5禁用包)

如何解决这个问题?

由于错误信息清楚地说明您的环境缺少mbstring扩展，因此只需安装它:sudo apt install php-mbstring