英文:

Ubuntu 18.04: laravel/framework v6.9.0 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system

问题

以下是您要翻译的内容：

在有人因重复问题而将此问题关闭之前，我已经检查了其他页面，但它们没有帮助。

我正在尝试在PHP 7.2上安装Laravel 6的包，我也尝试了PHP 7.4。

不幸的是，我收到以下错误消息：

laravel/framework v6.9.0需要ext-mbstring * -> 请求的PHP扩展mbstring在您的系统中不存在。

我已安装了mbstring并在7.2和7.4的php.ini文件中取消了注释：

extension=mbstring

我唯一知道的解决方法是重新启动apache2服务器。但我仍然收到错误消息。

我的composer.json需要PHP 7.2。

我还遇到了以下错误消息：

要启用扩展，请验证它们在您的.ini文件中是否已启用：
    - /etc/php/7.4/cli/php.ini
    - /etc/php/7.4/cli/conf.d/10-mysqlnd.ini
    - /etc/php/7.4/cli/conf.d/10-opcache.ini
    - /etc/php/7.4/cli/conf.d/10-pdo.ini
    - /etc/php/7.4/cli/conf.d/15-xml.ini
    - /etc/php/7.4/cli/conf.d/20-calendar.ini
    - /etc/php/7.4/cli/conf.d/20-ctype.ini
    - /etc/php/7.4/cli/conf.d/20-dom.ini
    - /etc/php/7.4/cli/conf.d/20-exif.ini
    - /etc/php/7.4/cli/conf.d/20-ffi.ini
    - /etc/php/7.4/cli/conf.d/20-fileinfo.ini
    - /etc/php/7.4/cli/conf.d/20-ftp.ini
    - /etc/php/7.4/cli/conf.d/20-gd.ini
    - /etc/php/7.4/cli/conf.d/20-gettext.ini
    - /etc/php/7.4/cli/conf.d/20-iconv.ini
    - /etc/php/7.4/cli/conf.d/20-json.ini
    - /etc/php/7.4/cli/conf.d/20-mysqli.ini
    - /etc/php/7.4/cli/conf.d/20-pdo_mysql.ini
    - /etc/php/7.4/cli/conf.d/20-phar.ini
    - /etc/php/7.4/cli/conf.d/20-posix.ini
    - /etc/php/7.4/cli/conf.d/20-readline.ini
    - /etc/php/7.4/cli/conf.d/20-shmop.ini
    - /etc/php/7.4/cli/conf.d/20-simplexml.ini
    - /etc/php/7.4/cli/conf.d/20-sockets.ini
    - /etc/php/7.4/cli/conf.d/20-sysvmsg.ini
    - /etc/php/7.4/cli/conf.d/20-sysvsem.ini
    - /etc/php/7.4/cli/conf.d/20-sysvshm.ini
    - /etc/php/7.4/cli/conf.d/20-tokenizer.ini
    - /etc/php/7.4/cli/conf.d/20-xmlreader.ini
    - /etc/php/7.4/cli/conf.d/20-xmlwriter.ini
    - /etc/php/7.4/cli/conf.d/20-xsl.ini
您还可以在终端中运行`php --ini`以查看PHP在CLI模式下使用的文件。```

<details>
<summary>英文:</summary>

Before someone takes this down for duplication. I&#39;ve checked the other pages and they weren&#39;t helpful. 

I&#39;m trying to install a package for Laravel 6 on PHP 7.2. I&#39;ve also tried PHP 7.4. 

Unfortunately, I get the following error:

laravel/framework v6.9.0 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system.

I've installed mbstring and uncommented it in both the php.ini files for 7.2 and 7.4:

extension=mbstring

The only solution to this I would know is restarting the apache2 server. But I still get the error. 

My composer.json is requiring PHP 7.2.

I'm also presented with these errors:

• Installation request for laravel/framework (locked at v6.9.0, required as ^6.2) -> satisfiable by laravel/framework[v6.9.0].

  To enable extensions, verify that they are enabled in your .ini files:

  • /etc/php/7.4/cli/php.ini
  • /etc/php/7.4/cli/conf.d/10-mysqlnd.ini
  • /etc/php/7.4/cli/conf.d/10-opcache.ini
  • /etc/php/7.4/cli/conf.d/10-pdo.ini
  • /etc/php/7.4/cli/conf.d/15-xml.ini
  • /etc/php/7.4/cli/conf.d/20-calendar.ini
  • /etc/php/7.4/cli/conf.d/20-ctype.ini
  • /etc/php/7.4/cli/conf.d/20-dom.ini
  • /etc/php/7.4/cli/conf.d/20-exif.ini
  • /etc/php/7.4/cli/conf.d/20-ffi.ini
  • /etc/php/7.4/cli/conf.d/20-fileinfo.ini
  • /etc/php/7.4/cli/conf.d/20-ftp.ini
  • /etc/php/7.4/cli/conf.d/20-gd.ini
  • /etc/php/7.4/cli/conf.d/20-gettext.ini
  • /etc/php/7.4/cli/conf.d/20-iconv.ini
  • /etc/php/7.4/cli/conf.d/20-json.ini
  • /etc/php/7.4/cli/conf.d/20-mysqli.ini
  • /etc/php/7.4/cli/conf.d/20-pdo_mysql.ini
  • /etc/php/7.4/cli/conf.d/20-phar.ini
  • /etc/php/7.4/cli/conf.d/20-posix.ini
  • /etc/php/7.4/cli/conf.d/20-readline.ini
  • /etc/php/7.4/cli/conf.d/20-shmop.ini
  • /etc/php/7.4/cli/conf.d/20-simplexml.ini
  • /etc/php/7.4/cli/conf.d/20-sockets.ini
  • /etc/php/7.4/cli/conf.d/20-sysvmsg.ini
  • /etc/php/7.4/cli/conf.d/20-sysvsem.ini
  • /etc/php/7.4/cli/conf.d/20-sysvshm.ini
  • /etc/php/7.4/cli/conf.d/20-tokenizer.ini
  • /etc/php/7.4/cli/conf.d/20-xmlreader.ini
  • /etc/php/7.4/cli/conf.d/20-xmlwriter.ini
  • /etc/php/7.4/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.

</details>


# 答案1
**得分**: 4

尝试安装 mbstring 扩展。

sudo apt-get install php7.4-mbstring

<details>
<summary>英文:</summary>

Try to install mbstring extension.

    sudo apt-get install php7.4-mbstring

</details>



# 答案2
**得分**: 4

请在Ubuntu操作系统上运行以下命令。

1. Sudo apt-get update

2. sudo apt-get install php-mbstring

<details>
<summary>英文:</summary>

Please run the below commands on Ubuntu OS.

 1. Sudo apt-get update

 2. sudo apt-get install php-mbstring

</details>