yum install -y libmcrypt libmcrypt-devel mcrypt mhash
wget http://pecl.php.net/get/mcrypt-1.0.3.tgz
tar -zxvf mcrypt-1.0.3.tgz
cd mcrypt-1.0.3/
/usr/local/php7.4.33/bin/phpize
./configure --with-php-config=/usr/local/php7.4.33/bin/php-config
make && make install

编辑启用
 vi /usr/local/php7.4.33/etc/php.ini
 

如果报错：
Cannot find autoconf. Please check your autoconf installation and the
$PHP_AUTOCONF environment variable. Then, rerun this script.
安装：
yum install autoconf

# 进入到扩展文件夹
cd php-7.0.1/ext/fileinfo
phpize
./configure -with-php-config=/usr/local/php/bin/php-config
make && make install

vim /usr/local/php/etc/php.ini
# 启用扩展
extension=fileinfo.so