XF 1.2 XenForo Required PHP Settings/Extensions

[Divvens]

Today my host has provided an option wherein we can choose what php version we wish to run along with settings/extensions. I'm not much knowledgeable in this field, we are currently running on php version 5.3 according to my host, my first question would be, should I upgrade/select 5.4? If yes, what settings/extensions are required by XenForo? I've attached screenshots below that show you what I have to play with.

 

[Sheratan]

https://xenforo.com/purchase/

PHP extensions: MySQLi, GD (with JPEG support), PCRE, SPL, SimpleXML, DOM, JSON, iconv, ctype

 

[Divvens]

https://xenforo.com/purchase/

PHP extensions: MySQLi, GD (with JPEG support), PCRE, SPL, SimpleXML, DOM, JSON, iconv, ctype

I notice that;
"PCRE", "SPL", "iconv" and "ctype" aren't even in the options. I guess I'll have to contact my host for further details, thanks.

 

[EQnoble]

I notice that;
"PCRE", "SPL", "iconv" and "ctype" aren't even in the options. I guess I'll have to contact my host for further details, thanks.

In PHP 5.4 those modules are part of the core installation I believe.

 

[Divvens]

I just upgraded to php 5.4 and wow, the site got a lot faster

Is it just me or does php improve that much?