mcrypt扩展从PHP7.1.0开始废弃，所以需要继续使用这个扩展的话需要自行编译mcrypt扩展 或者采用pcel安装。
yum install libmcrypt libmcrypt-devel mcrypt mhash
wget http://pecl.php.net/get/mcrypt-1.0.1.tgz
tar xf mcrypt-1.0.1.tgz
cd mcrypt-1.0.1
/www/server/php/73/bin/phpize
./configure --with-php-config=/www/server/php/73/bin/php-config
make && make install
安装执行成功后，在 宝塔面板-软件管理-PHP7.3设置-配置文件 的最底部，
添加一行：extension=mcrypt.so之后重启服务器的PHP服务即可完成mcrypt扩展的安装。
最新的包:
http://pecl.php.net/package/mcrypt
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