CentOS 7
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Install PHP 5.62016/07/05
 
The version of PHP in CentOS 7 repository is 5.4 but Install 5.6 with RPM package if you need.
[1] It's possible to install from CentOS SCLo Software Collections.
It's OK to install it even if 5.4 is already installed because 5.6 is located on another PATH.
# install from SCLo

[root@dlp ~]#
yum --enablerepo=centos-sclo-rh -y install rh-php56
[2] Packages from Software Collections are installed uder the /opt directory.
To use it, Load environment variables like follows.
# load environment variables

[root@dlp ~]#
scl enable rh-php56 bash
[root@dlp ~]#
php -v

PHP 5.6.5 (cli) (built: Mar 23 2016 19:17:38)
Copyright (c) 1997-2014 The PHP Group
Zend Engine v2.6.0, Copyright (c) 1998-2014 Zend Technologies
[root@dlp ~]#
which php

/opt/rh/rh-php56/root/usr/bin/php
[3] If you'd like to enable PHP 5.6 automatically at login time, configure like follows.
[root@dlp ~]#
vi /etc/profile.d/rh-php56.sh
# create new

#!/bin/bash

source /opt/rh/rh-php56/enable
export X_SCLS="`scl enable rh-php56 'echo $X_SCLS'`"
[4] To use 5.6 on Apache httpd, Configure PHP-FPM like follows.
# install from SCLo

[root@dlp ~]#
yum --enablerepo=centos-sclo-rh -y install rh-php56-php-fpm
[root@dlp ~]#
vi /etc/httpd/conf.d/php.conf
# line 5: change like follows

<FilesMatch \.php$>
#
    SetHandler application/x-httpd-php
    SetHandler "proxy:fcgi://127.0.0.1:9000"

</FilesMatch>
[root@dlp ~]#
systemctl start rh-php56-php-fpm

[root@dlp ~]#
systemctl enable rh-php56-php-fpm

[root@dlp ~]#
systemctl restart httpd

[5] If you'd like to use 5.6 as embedded on Apache httpd, Configure like follows.
# install from SCLo

[root@dlp ~]#
yum --enablerepo=centos-sclo-rh -y install rh-php56-php
[root@dlp ~]#
vi /etc/httpd/conf.modules.d/10-php.conf
# change like follows

<IfModule prefork.c>
  LoadModule php5_module /opt/rh/httpd24/root/usr/lib64/httpd/modules/librh-php56-php5.so
</IfModule>
[root@dlp ~]#
systemctl restart httpd

# create phpinfo to verify working

[root@dlp ~]#
echo '<?php phpinfo(); ?>' > /opt/rh/httpd24/root/var/www/html/info.php

[root@dlp ~]#
curl http://localhost/info.php | grep 'PHP Version' | tail -1 | sed -e 's/<[^>]*>//g' 

  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 68819    0 68819    0     0  5529k      0 --:--:-- --:--:-- --:--:-- 6109k
PHP Version 5.6.5
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