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安装拓展

进入拓展源码目录

cd /usr/local/src/php-7.4.14/ext/mbstring

/usr/local/php74/bin/phpize

输出

Configuring for:
PHP Api Version:         20190902
Zend Module Api No:      20190902
Zend Extension Api No:   320190902

./configure --with-php-config=/usr/local/php74/bin/php-config

make && make install

报 Cannot find autoconf.错误。需要安装 autoconf

修改 php.ini 文件，开启拓展

extension=mbstring

重启 php-fpm

ps aux|grep php-fpm

root      47498  0.0  0.3 157204  3036 ?        Ss   20:50   0:00 php-fpm: master process (/usr/local/php74/etc/php-fpm.conf)
nobody    47503  0.0  0.4 157268  4916 ?        S    20:50   0:00 php-fpm: pool www
nobody    47504  0.0  0.2 157204  2624 ?        S    20:50   0:00 php-fpm: pool www
root     102263  0.0  0.0 112824   976 pts/2    R+   21:03   0:00 grep --color=auto php-fpm

重启：

kill -USR2 47498

验证

cd /usr/local/php74/bin

./php -m