Downgrade from PHP 5.6 to 5.5
7095
How do I install different (upgrade or downgrade) PHP version in still supported Ubuntu release?
83612
Is it possible to install MySQL 5.5 or 5.6 on Ubuntu 16.04?
421
How do I update a Drupal distribution to a newer version?
114959
PHP 5.5.13 on CentOS 6.5 with yum
151232
downgrading rails 4 to 3.2
87608
Drupal 6 To 7 Migration
10283
Compare two version strings in PHP
3612
Can I downgrade to Mavericks after installing Yosemite (beta/developer preview)?
125663
How to allow to change php version via .htaccess in Apache?
79030
Installing PHP 5.6 on Xenial (16.04)
138307
Safely update php 5.3.3 to >=5.3.4 on centos 6
46035
The PHP version is not correctly detected
62129
In PHP (>= 5.0), is passing by reference faster?
22276
How do I downgrade Firefox v. 57 to v. 56?
87680
How to reverse '-proposed' channel package upgrade?
149044
Can I downgrade to an earlier version of Android after installing an OTA update?
125216
Deprecated MySQL extension in PHP 5.5.x