mbstring扩展报错

cww001

php.ini里开启了mbstring扩展报错，文件不存在，需要自己安装吗


PHP Warning:  PHP Startup: Unable to load dynamic library 'mbstring' (tried: /usr/local/php/lib/php/extensions/no-
debug-non-zts-20200930/mbstring (/usr/local/php/lib/php/extensions/no-debug-non-zts-20200930/mbstring: cannot open
shared object file: No such file or directory), /usr/local/php/lib/php/extensions/no-debug-non-zts-20200930/mbstr
ing.so (/usr/local/php/lib/php/extensions/no-debug-non-zts-20200930/mbstring.so: cannot open shared object file: N
o such file or directory)) in Unknown on line 0                                                                  
PHP Fatal error:  Uncaught Error: Call to undefined function Symfony\Component\Process\proc_get_status() in phar:/
//usr/local/bin/composer/vendor/symfony/process/Process.php:1345      

licess

mbstring这种最基本的模块怎可能会不默认安装

即使未安装的模块也不是这个操作方法，官网常见问题里都有说明教程