linux软件安装，大多直接利用yum安装，避免了依赖引起的其他问题，而默认提供的源不一定存在需要的软件版本，因此需要更新源。
当前个人的centos版本为7
1安装含php5.6的remi repo（centos 7）
$ rpm -Uvh http://download.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm $ rpm -Uvh http://rpms.famillecollet.com/enterprise/remi-release-7.rpm
2查看现在的repo
[root@iZwz9agxh9ddcfm68xu5iqZ ~]# yum repolist all Loaded plugins: langpacks repo id repo name status base/7/x86_64 CentOS-7 - Base enabled: 9,363 base-debuginfo/x86_64 CentOS-7 - Debuginfo disabled base-source/7 CentOS-7 - Base Sources disabled centosplus/7/x86_64 CentOS-7 - Plus disabled centosplus-source/7 CentOS-7 - Plus Sources disabled contrib/7/x86_64 CentOS-7 - Contrib disabled extras-source/7 CentOS-7 - Extras Sources disabled fasttrack/7/x86_64 CentOS-7 - fasttrack disabled remi Remi's RPM repository for Enterprise Linux 7 - x86_64 disabled
remi-php55 Remi's PHP 5.5 RPM repository for Enterprise Linux 7 - x86_64 disabled remi-php55-debuginfo/x86_64 Remi's PHP 5.5 RPM repository for Enterprise Linux 7 - x86_64 - debuginfo disabled remi-php56 Remi's PHP 5.6 RPM repository for Enterprise Linux 7 - x86_64 enabled: 384 remi-php56-debuginfo/x86_64 Remi's PHP 5.6 RPM repository for Enterprise Linux 7 - x86_64 - debuginfo disabled remi-php70 Remi's PHP 7.0 RPM repository for Enterprise Linux 7 - x86_64 disabled remi-php70-debuginfo/x86_64 Remi's PHP 7.0 RPM repository for Enterprise Linux 7 - x86_64 - debuginfo disabled remi-php70-test Remi's PHP 7.0 test RPM repository for Enterprise Linux 7 - x86_64 disabled remi-php70-test-debuginfo/x86_64 Remi's PHP 7.0 test RPM repository for Enterprise Linux 7 - x86_64 - debuginfo disabled ...
发现了php5.6的remi，而status为disabled，因此需要开启。
2安装yum-config-manager
$ yum search yum-config-manager Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * base: ftp.yzu.edu.tw * epel: mirror01.idc.hinet.net * extras: ftp.yzu.edu.tw * remi-safe: mirror.innosol.asia * updates: ftp.yzu.edu.tw =================================== Matched: yum-config-manager =================================== remi-release.noarch : YUM configuration for remi repository yum-utils.noarch : Utilities based around the yum package manager $ yum install yum-utils
3开启repo
$ yum-config-manager --enable remi $ yum-config-manager --enable remi-php56
4此时再搜索yum search php可以发现很多的php的版本，此后再正常安装。