CentOS安装php-mbstring错误

I am trying to install mbstring on CentOS 6.7 with PHP version 7 :

yum --enablerepo=remi install php-mbstring

, but I get this error:

php70w-common conflicts with php-common-5.4.45-11.el6.remi.x86_64

CentOS was with default PHP version 5.3 (I think), but before a week I updated it to PHP 7 and now, when I want to install mbstring I see this error. How can I fix this ?

That's not a remi package. His packages look like php-common, not php70w-common. You'll need to edit the /etc/yum.repos.d/remi.repo and enable the PHP 7 repo for his site.

Once you've done that, identify which repo is feeding you php70w files and exclude them.

php-mbstring for PHP 7 is not in "remi" repository but in "remi-php70" repository, see the Configuration Wizard.