Drop php 5.3

[yosifkit]

It fails when trying to build --with-openssl. I am not sure what dependency (like autoconf 2.13) we seem to be missing. If someone has more experience building php 5.3 we can look to add it back (or fix it now and drop this PR).

Any comments on dropping or fixing 5.3?

[tianon]

Even wheezy is at 5.4, so I'm +1 on this (especially since it's causing issues).

[thaJeztah]

Being able to run old versions of PHP for testing in a "safe" environment is a major advantage of docker. From that perspective, I would prefer PHP 5.3 to be kept in.

However, if this is the official PHP image, it would make sense to no longer support it.

Otoh; PHP 5.3 was just EOL'd two months ago, I'm certain that a lot of servers are still running it, and thus, being able to test code in Docker would be a nice feature :)

[thaJeztah]

@tianon yes, but I think ubuntu 12.04 still is on 5.3?

[tianon]

Done deal: http://php.net/eol.php

If upstream doesn't support it, it's impossible for us to.

[helderco]

For anyone looking for it here, I still needed a PHP 5.3 with FPM image so I built my own at https://registry.hub.docker.com/u/helder/php-5.3/

To fix --with-openssl, I compiled openssl from source. The image is based off of the latest official builds, so it has the same paths, docker-php-ext-install, et all.