因为mbstring，composer没有安装laravel项目

Question

我正在尝试安装composer安装的laravel项目，但作为回报，它会给出以下错误。

Problem 1
    - Installation request for laravel/framework v7.14.1 -> satisfiable by laravel/framework[v7.14.1].
    - laravel/framework v7.14.1 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system.
  Problem 2
    - Installation request for league/commonmark 1.4.3 -> satisfiable by league/commonmark[1.4.3].
    - league/commonmark 1.4.3 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system.
  Problem 3
    - Installation request for facade/ignition 2.0.6 -> satisfiable by facade/ignition[2.0.6].
    - facade/ignition 2.0.6 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system.
  Problem 4
    - Installation request for mockery/mockery 1.4.0 -> satisfiable by mockery/mockery[1.4.0].
    - mockery/mockery 1.4.0 requires php ^7.3.0 -> your PHP version (7.2.24) does not satisfy that requirement.
  Problem 5
    - Installation request for phpunit/phpunit 8.5.5 -> satisfiable by phpunit/phpunit[8.5.5].
    - phpunit/phpunit 8.5.5 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system.
  Problem 6
    - Installation request for scrivo/highlight.php v9.18.1.1 -> satisfiable by scrivo/highlight.php[v9.18.1.1].
    - scrivo/highlight.php v9.18.1.1 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system.
  Problem 7
    - laravel/framework v7.14.1 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system.
    - facade/flare-client-php 1.3.2 requires illuminate/pipeline ^5.5|^6.0|^7.0 -> satisfiable by laravel/framework[v7.14.1].
    - Installation request for facade/flare-client-php 1.3.2 -> satisfiable by facade/flare-client-php[1.3.2].

但是mbstring已经安装在php72中了。首先，我检查php --v的版本，然后它返回

PHP7.2.24

然后检查加载的模块php72 -m和有mbstring也没有问题.之后，我检查了mbstring是否已启用，php72 -i | grep mbstring是否已启用

启用mbstring

=>的多字节解码支持

最后，为什么作曲家没有看到mbstring？我检查composer show -p查看的模块。，不，，没有mbstring！知道为什么作曲家没有看到mbstring，以及我如何解决这个问题吗？

另外，我在Centos 7

Answer 1

在php7.2中缺少mbstring扩展。

运行sudo apt-get install -y php7.2-mbstring

编辑

另外，嘲笑/嘲弄1.4.0需要php ^7.3.0。我建议升级您的项目php版本。

Answer 2

日志本身就说明了问题。

laravel/framework v7.14.1需要ext-mbstring

league/commonmark 1.4.3需要ext-mbstring

外观/点火2.0.6需要ext-mbstring

phpunit/phpunit 8.5.5需要ext-mbstring

scrivo/HTFLIT.php v9.18.1.1需要ext-mbstring

尝试以下命令

yum install php-mbstring

然后

作曲家更新