yum 软件版本版本问题

found out problem comes from the new PHP version (5.4, 5.4), which installed in a separate repo. 
So, we just need to install php-bcmath in the main repo (version 5.3) using command:

yum install php-bcmath --enablerepo=remi 

With "remi" is the main repo, you can see it by go to /etc/yum.repos.d then using ll

You can try (for Centos 6.4)

rpm -Uvh 
yum install php54w

yum install yum-plugin-replace

yum replace php-common --replace-with=php54w-common

yum install php54w-bcmath

 

(source: )

But it may cause another problem about versions.

The simple way is uninstall php 5.4 (or 5.5),
install php 5.3, install php-bcmatch then update to php5.4 (or newer)