Why is there a problem with php-mbstring and php-bcmath when installing zabbix 3.4 on Oracle Linux 7.4?

Question

linux

Hello.
have an OS

NAME="Oracle Linux Server"
VERSION="7.4"
ID="ol"
VERSION_ID="7.4"
PRETTY_NAME="Oracle Linux Server 7.4"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:oracle:linux:7:4:server"
HOME_URL="https://linux.oracle.com/"
BUG_REPORT_URL="https://bugzilla.oracle.com/"

ORACLE_BUGZILLA_PRODUCT="Oracle Linux 7"
ORACLE_BUGZILLA_PRODUCT_VERSION=7.4
ORACLE_SUPPORT_PRODUCT="Oracle Linux"
ORACLE_SUPPORT_PRODUCT_VERSION=7.4

trying to install zabbix 3.4

rpm -Uvh http://repo.zabbix.com/zabbix/3.4/rhel/7/x86_64/zabbix-release-3.4-1.el7.centos.noarch.rpm
yum install zabbix-server-mysql zabbix-web-mysql

an error is returned

Error: Package: zabbix-web-3.4.1-1.el7.noarch (zabbix)
           Requires: php-mbstring
Error: Package: zabbix-web-3.4.1-1.el7.noarch (zabbix)
           Requires: php-bcmath

How to solve this problem?
ps
tried to install like this
sudo yum install php-mbstring
error

Loaded plugins: ulninfo
No package php-mbstring available.
Error: Nothing to do

Answer 1

Here is your zabbix.
solution with php

https://linuxconfig.org/installation-of-missing-php-mbstring-on-rhel-7-linux