Adding some instructions about downgrading PHP to 5.2 on Ubuntu 12.10

php5.2/karmic_1.list

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+# deb cdrom:[Ubuntu 10.04 LTS _Lucid Lynx_ - Release amd64 (20100429)]/ karmic main restricted
+# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
+# newer versions of the distribution.
+
+deb http://old-releases.ubuntu.com/ubuntu/ karmic main restricted
+deb-src http://old-releases.ubuntu.com/ubuntu/ karmic main restricted
+
+## Major bug fix updates produced after the final release of the
+## distribution.
+deb http://old-releases.ubuntu.com/ubuntu/ karmic-updates main restricted
+deb-src http://old-releases.ubuntu.com/ubuntu/ karmic-updates main restricted
+
+## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
+## team. Also, please note that software in universe WILL NOT receive any
+## review or updates from the Ubuntu security team.
+deb http://old-releases.ubuntu.com/ubuntu/ karmic universe
+deb-src http://old-releases.ubuntu.com/ubuntu/ karmic universe
+deb http://old-releases.ubuntu.com/ubuntu/ karmic-updates universe
+deb-src http://old-releases.ubuntu.com/ubuntu/ karmic-updates universe
+
+## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu 
+## team, and may not be under a free licence. Please satisfy yourself as to 
+## your rights to use the software. Also, please note that software in 
+## multiverse WILL NOT receive any review or updates from the Ubuntu
+## security team.
+deb http://old-releases.ubuntu.com/ubuntu/ karmic multiverse
+deb-src http://old-releases.ubuntu.com/ubuntu/ karmic multiverse
+deb http://old-releases.ubuntu.com/ubuntu/ karmic-updates multiverse
+deb-src http://old-releases.ubuntu.com/ubuntu/ karmic-updates multiverse
+
+## Uncomment the following two lines to add software from the 'backports'
+## repository.
+## N.B. software from this repository may not have been tested as
+## extensively as that contained in the main release, although it includes
+## newer versions of some applications which may provide useful features.
+## Also, please note that software in backports WILL NOT receive any review
+## or updates from the Ubuntu security team.
+# deb http://old-releases.ubuntu.com/ubuntu/ karmic-backports main restricted universe multiverse
+# deb-src http://old-releases.ubuntu.com/ubuntu/ karmic-backports main restricted universe multiverse
+
+## Uncomment the following two lines to add software from Canonical's
+## 'partner' repository.
+## This software is not part of Ubuntu, but is offered by Canonical and the
+## respective vendors as a service to Ubuntu users.
+# deb http://archive.canonical.com/ubuntu karmic partner
+# deb-src http://archive.canonical.com/ubuntu karmic partner
+
+deb http://old-releases.ubuntu.com/ubuntu karmic-security main restricted
+deb-src http://old-releases.ubuntu.com/ubuntu karmic-security main restricted
+deb http://old-releases.ubuntu.com/ubuntu karmic-security universe
+deb-src http://old-releases.ubuntu.com/ubuntu karmic-security universe
+deb http://old-releases.ubuntu.com/ubuntu karmic-security multiverse
+deb-src http://old-releases.ubuntu.com/ubuntu karmic-security multiverse

php5.2/php

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+Package: php5
+Pin: release a=karmic
+Pin-Priority: 991
+
+Package: php5-gd
+Pin: release a=karmic
+Pin-Priority: 991
+
+Package: php5-common
+Pin: release a=karmic
+Pin-Priority: 991
+
+Package: php5-curl
+Pin: release a=karmic
+Pin-Priority: 991
+
+Package: php5-mysql
+Pin: release a=karmic
+Pin-Priority: 991
+
+
+Package: php5-pear
+Pin: release a=karmic
+Pin-Priority: 991
+
+Package: php5-xsl
+Pin: release a=karmic
+Pin-Priority: 991
+
+
+Package: php-pear
+Pin: release a=karmic
+Pin-Priority: 991
+
+Package: php5-cli
+Pin: release a=karmic
+Pin-Priority: 991
+
+Package: php5-memcache
+Pin: release a=karmic
+Pin-Priority: 991
+
+Package: php5-pgsql
+Pin: release a=karmic
+Pin-Priority: 991
+
+Package: php-apc
+Pin: release a=karmic
+Pin-Priority: 991
+
+Package: php5-xmlrpc
+Pin: release a=karmic
+Pin-Priority: 991
+
+Package: libapache2-mod-php5
+Pin: release a=karmic
+Pin-Priority: 991

php5.2/readme.txt

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+From http://randyfay.com/content/php-52-ubuntu-1004-lucid-lynx-seems-work-1204-too
+
+Seems to work in 12.10.
+
+Put php in /etc/apt/preferences.d
+Put karmic.list in /etc/apt/sources.d