提示报这个错

[zhao459399177]

PHP Fatal error: Uncaught Error: Call to undefined function Symfony\Component\Console\mb_detect_encoding() in /usr/share/php/Symfony/Component/Console/Application.php:1096
Stack trace:
#0 /usr/share/php/Symfony/Component/Console/Application.php(650): Symfony\Component\Console\Application->stringWidth(' [Composer\Exc...')
#1 /usr/share/php/Symfony/Component/Console/Application.php(131): Symfony\Component\Console\Application->renderException(Object(Composer\Exception\NoSslException), Object(Symfony\Component\Console\Output\StreamOutput))
#2 /usr/share/php/Composer/Console/Application.php(103): Symfony\Component\Console\Application->run(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#3 /usr/bin/composer(57): Composer\Console\Application->run()
#4 {main}
thrown in /usr/share/php/Symfony/Component/Console/Application.php on line 1096

Fatal error: Uncaught Error: Call to undefined function Symfony\Component\Console\mb_detect_encoding() in /usr/share/php/Symfony/Component/Console/Application.php:1096
Stack trace:
#0 /usr/share/php/Symfony/Component/Console/Application.php(650): Symfony\Component\Console\Application->stringWidth(' [Composer\Exc...')
#1 /usr/share/php/Symfony/Component/Console/Application.php(131): Symfony\Component\Console\Application->renderException(Object(Composer\Exception\NoSslException), Object(Symfony\Component\Console\Output\StreamOutput))
#2 /usr/share/php/Composer/Console/Application.php(103): Symfony\Component\Console\Application->run(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#3 /usr/bin/composer(57): Composer\Console\Application->run()
#4 {main}
thrown in /usr/share/php/Symfony/Component/Console/Application.php on line 1096
文件不存在
需要什么其他么？

[cabal-php]

composer 用的国内镜像吗？

尝试使用官方镜像服务器

[cabal-php]

还有php什么版本，是否安装了ext-mbstring

[zhao459399177]

composer 使用国内镜像，php 是7.2.9 mbsring扩展也安装了

[zhao459399177]

swoole 版本4.1 的会报错

[cabal-php]

php --ri mbstring 看看

[zhao459399177]

支持swoole 4.1 么