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We have a years old server which is CentOS 5.2 and PHP 5.1.6. It serves mainly static html pages plus a few simply PHP webforms.

Now there is a need to upgrade PHP to 5.2.x for adding a new PHP onto the same server. Is there any caveat I should be aware of? Any experience to share with? Thanks!

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up vote 0 down vote accepted

I've done so on a heavy server with millions of scripts, You'll notice almost nothing. The major change IMHO is :

$object.="x";

No longer works and errors, since objects are not automatically casted to strings via

__toString();

and you need to do that manually. But few scripts do that and those who do, usually cast manually.

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