mcrypt扩展从php7.1.0开始废弃；自php7.2.0起，会移到pecl。还好，安装过程不复杂。环境：Centos7.X宝塔面板Nginx+PHP7.3开始安装。1yum安装依赖包：yuminstalllibmcryptlibmcrypt-develmcryptmhash2在php官网下载mcrypt包，php扩展官网wgethttp://pecl.php.net/get/mcrypt-1
