第一步：彻底卸载 webtatic 源的 PHP 7.2
sudo systemctl stop php-fpm
sudo yum remove php*
ls -l /etc/yum.repos.d/ | grep webtatic
sudo mkdir /root/repo-backup
sudo mv /etc/yum.repos.d/webtatic*.repo /root/repo-backup/
sudo yum clean all

第二步：配置 Remi 源并安装 PHP 7.4
sudo yum install -y epel-release
sudo yum install -y https://rpms.remirepo.net/enterprise/remi-release-7.rpm
sudo yum install -y yum-utils
sudo yum-config-manager --enable remi-php74
yum -y install php-php-devel php-php.x86_64 php-php-cli.x86_64 php-php-common.x86_64 php-php-gd.x86_64 php-php-ldap.x86_64 php-php-mbstring.x86_64 php-php-mcrypt.x86_64  php-php-pdo.x86_64   php-php-mysqlnd  php-php-fpm php-php-opcache php-php-pecl-redis php-php-pecl-mongodb php-php-xml php-php-bcmath php-php-pecl-zip

sudo systemctl start php-fpm
sudo systemctl enable php-fpm