php3 compatibility with php4?

From: Date: Wed, 06 Dec 2000 05:30:53 +0000
Subject: php3 compatibility with php4?
Groups: php.general 
Request: Send a blank email to php-general+get-28852@lists.php.net to get a copy of this message
Ok, I've just about searched everywhere for this answer, and either a)isn't documented or b)I'm not looking in right places(more probable). If I have php3 installed, and have a whole lot of pages, scripts written in php3, if I upgrade my system to php4 will they be rendered useless? Thanks.

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