As Ivo Jansch pointed out yesterday it's a month until the fateful day that PHP4 will officially die:
It's July the 8th. Today I realized that we're exactly one month away from 8-8-8, the final blow to PHP4.
August 8th marks the point when nothing (at all) will be done to any version of PHP4 again. Full support ended back in December of 2007 with no new versions being released. 8-8-08 marks the end of that as well and PHP4 developers that discover bugs may not be able to get them fixed.
Ivo sums it it perfectly:
I'm not trying to scare you. No wait, I am. Don't let 8-8-8 become the PHP community's 6-6-6 and abandon PHP4 while you still can.