Since it's not being supported anymore by the developers I personalliy don't see a reason to keep it. If your host wont upgrade maybe it's time to move?
Quote:
The PHP development team hereby announces that support for PHP 4 will continue until the end of this year only. After 2007-12-31 there will be no more releases of PHP 4.4. We will continue to make critical security fixes available on a case-by-case basis until 2008-08-08. Please use the rest of this year to make your application suitable to run on PHP 5.
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