Best way to remove global variables so we can upgrade to php 5.4

Hello,
We are running PHP 5.3.3 and want to upgrade to PHP 5.4.23.
We tried it last night but quickly rolled back because it caused our sites to not load.
We were told (by Rackspace or Dedicated Server Provider) it is because we use global variables and they are no longer supported in 5.4.

Is there an easy way to track down where the global variables are?
Or some code that you can add that somehow converts them?

Or is this one of those things that you need to go through every page of your website and do it manually?

Thank you in advance for your advice.
Razzmataz73Asked:
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ienaxxxCommented:
Do you mean that you use REGISTER_GLOBALS in the PHP ini?

can't believe, but i think global declarations (like "global $varName") should always work fine even with the newest versions of PHP...

If i were you i'd use notepad++'s function to searc in multiple files with regexp.
Hope this helps.
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Razzmataz73Author Commented:
I will ask them to clarify.
This is what they said in our ticket:

It looks like these sites are coded using global variables which have been completely removed by php 5.4. Therefore the server didn't recognize the structure of your site and in turn wouldn't display the page. We also looked at the error logs and it was showing lots of undefined variables.

The mysql upgrade went smooth so you are now running mysql 5.5. In order to properly upgrade php, the sites that contain global variables would have to be redeveloped for php 5.4.

If you have any more questions, feel free to update this ticket or call anytime. We're always glad to do what we can to assist you!
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Ray PaseurCommented:
Thanks for the points.  Good luck with the upgrade! ~Ray
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Razzmataz73Author Commented:
Thanks Ray,
As always you are a GREAT HELP!
:)
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Ray PaseurCommented:
That's only because I make more mistakes than anyone else ;-)
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