机子是centOS6.5，于是首先查看软件库中有没有扩展：yum search php-mysql
既然有那就开始安装扩展吧：yum install php-mysql
dang，出现了如下错误
Transaction Check Error:
file /usr/share/mysql/charsets/Index.xml from install of mysql-libs-5.1.73-8.el6_8.x86_64 conflicts with file from package mysql-community-common-5.7.24-1.el6.x86_64
file /usr/share/mysql/charsets/armscii8.xml from install of mysql-libs-5.1.73-8.el6_8.x86_64 conflicts with file from package mysql-community-common-5.7.24-1.el6.x86_64
file /usr/share/mysql/charsets/ascii.xml from install of mysql-libs-5.1.73-8.el6_8.x86_64 conflicts with file from package mysql-community-common-5.7.24-1.el6.x86_64
file /usr/share/mysql/charsets/cp1250.xml from install of mysql-libs-5.1.73-8.el6_8.x86_64 conflicts with file from package mysql-community-common-5.7.24-1.el6.x86_64
file /usr/share/mysql/charsets/cp1256.xml from install of mysql-libs-5.1.73-8.el6_8.x86_64 conflicts with file from package mysql-community-common-5.7.24-1.el6.x86_64
file /usr/share/mysql/charsets/cp1257.xml from install of mysql-libs-5.1.73-8.el6_8.x86_64 conflicts with file from package mysql-community-common-5.7.24-1.el6.x86_64
file /usr/share/mysql/charsets/cp850.xml from install of mysql-libs-5.1.73-8.el6_8.x86_64 conflicts with file from package mysql-community-common-5.7.24-1.el6.x86_64
file /usr/share/mysql/charsets/cp852.xml from install of mysql-libs-5.1.73-8.el6_8.x86_64 conflicts with file from package mysql-community-common-5.7.24-1.el6.x86_64
file /usr/share/mysql/charsets/cp866.xml from install of mysql-libs-5.1.73-8.el6_8.x86_64 conflicts with file from package mysql-community-common-5.7.24-1.el6.x86_64
file /usr/share/mysql/charsets/dec8.xml from install of mysql-libs-5.1.73-8.el6_8.x86_64 conflicts with file from package mysql-community-common-5.7.24-1.el6.x86_64
file /usr/share/mysql/charsets/geostd8.xml from install of mysql-libs-5.1.73-8.el6_8.x86_64 conflicts with file from package mysql-community-common-5.7.24-1.el6.x86_64
file /usr/share/mysql/charsets/greek.xml from install of mysql-libs-5.1.73-8.el6_8.x86_64 conflicts with file from package mysql-community-common-5.7.24-1.el6.x86_64
file /usr/share/mysql/charsets/hebrew.xml from install of mysql-libs-5.1.73-8.el6_8.x86_64 conflicts with file from package mysql-community-common-5.7.24-1.el6.x86_64
file /usr/share/mysql/charsets/hp8.xml from install of mysql-libs-5.1.73-8.el6_8.x86_64 conflicts with file from package mysql-community-common-5.7.24-1.el6.x86_64
file /usr/share/mysql/charsets/keybcs2.xml from install of mysql-libs-5.1.73-8.el6_8.x86_64 conflicts with file from package mysql-community-common-5.7.24-1.el6.x86_64
file /usr/share/mysql/charsets/koi8r.xml from install of mysql-libs-5.1.73-8.el6_8.x86_64 conflicts with file from package mysql-community-common-5.7.24-1.el6.x86_64
file /usr/share/mysql/charsets/koi8u.xml from install of mysql-libs-5.1.73-8.el6_8.x86_64 conflicts with file from package mysql-community-common-5.7.24-1.el6.x86_64
file /usr/share/mysql/charsets/latin1.xml from install of mysql-libs-5.1.73-8.el6_8.x86_64 conflicts with file from package mysql-community-common-5.7.24-1.el6.x86_64
file /usr/share/mysql/charsets/latin2.xml from install of mysql-libs-5.1.73-8.el6_8.x86_64 conflicts with file from package mysql-community-common-5.7.24-1.el6.x86_64
file /usr/share/mysql/charsets/latin5.xml from install of mysql-libs-5.1.73-8.el6_8.x86_64 conflicts with file from package mysql-community-common-5.7.24-1.el6.x86_64
file /usr/share/mysql/charsets/latin7.xml from install of mysql-libs-5.1.73-8.el6_8.x86_64 conflicts with file from package mysql-community-common-5.7.24-1.el6.x86_64
file /usr/share/mysql/charsets/macce.xml from install of mysql-libs-5.1.73-8.el6_8.x86_64 conflicts with file from package mysql-community-common-5.7.24-1.el6.x86_64
file /usr/share/mysql/charsets/macroman.xml from install of mysql-libs-5.1.73-8.el6_8.x86_64 conflicts with file from package mysql-community-common-5.7.24-1.el6.x86_64
file /usr/share/mysql/charsets/swe7.xml from install of mysql-libs-5.1.73-8.el6_8.x86_64 conflicts with file from package mysql-community-common-5.7.24-1.el6.x86_64
file /usr/share/mysql/czech/errmsg.sys from install of mysql-libs-5.1.73-8.el6_8.x86_64 conflicts with file from package mysql-community-common-5.7.24-1.el6.x86_64
file /usr/share/mysql/danish/errmsg.sys from install of mysql-libs-5.1.73-8.el6_8.x86_64 conflicts with file from package mysql-community-common-5.7.24-1.el6.x86_64
file /usr/share/mysql/dutch/errmsg.sys from install of mysql-libs-5.1.73-8.el6_8.x86_64 conflicts with file from package mysql-community-common-5.7.24-1.el6.x86_64
file /usr/share/mysql/english/errmsg.sys from install of mysql-libs-5.1.73-8.el6_8.x86_64 conflicts with file from package mysql-community-common-5.7.24-1.el6.x86_64
file /usr/share/mysql/estonian/errmsg.sys from install of mysql-libs-5.1.73-8.el6_8.x86_64 conflicts with file from package mysql-community-common-5.7.24-1.el6.x86_64
file /usr/share/mysql/french/errmsg.sys from install of mysql-libs-5.1.73-8.el6_8.x86_64 conflicts with file from package mysql-community-common-5.7.24-1.el6.x86_64
仔细分析，原来是之前安装过MySQL5.7，现在安装的MySQL-libs是5.1版本，所以兼容出现了问题
解决
感谢热心网友，发现可以使用MySQL-shared-compat来解决这个兼容性问题
首先访问 http://rpm.pbone.net/index.php3?stat=3&search=MySQL-shared-compat&srodzaj=3&dist%5B%5D=52
点击图中箭头处
解决
感谢热心网友，发现可以使用MySQL-shared-compat来解决这个兼容性问题
首先访问 http://rpm.pbone.net/index.php3?stat=3&search=MySQL-shared-compat&srodzaj=3&dist%5B%5D=52
点击图中箭头处
然后想办法拿到下图中的链接
下载，
然后安装
接下来，你就可以正常的安装yum install php-mysql 了，因为已经解决了兼容性的问题了。