yum-config-manager --disable remi-php54
yum-config-manager --enable remi-php73
yum install php php-common php-cli php-gd php-curl php-mysqlnd php-fpm php-zip php-json php-pdo
systemctl restart httpd
[root@localhost ~]# php -v
PHP 7.3.5 (cli) (built: Apr 30 2019 08:37:17) ( NTS )
Copyright (c) 1997-2018 The PHP Group
Zend Engine v3.3.5, Copyright (c) 1998-2018 Zend Technologies