Ver 3.8.1 question with my site provider e-mail making PHP 5.4 changes

[محروم.كوم]

Hello I have a question since I am running Version 3.8.1 with no issues. I have my site locked to new members.

Currently do not have the funds to upgrade vBulletin, so I am asking if my site is going to work if I upgrade to PHP 5.4

I am running MySQL5.0 and PHP 4.2

I switch from XP Pro to Win7 64 SP1 and do not have a PHP edit program

My site provider has e-mailed me this info and says that I have to upgrade or be shut down?

From April 1, 2013, the PHP versions 4 and 5.2 will not be supported anymore.
As of now, we will use the version PHP 5.4 instead. __DEFINE_LIKE_SHARE__