This tutorial: http://wiki.centos.org/HowTos/PHP_5.1_To_5.2 worked for my CentOS 5.3 + ISPConfig 2.2.32 setup, it should work for ISPConfig 3 too...
i managed to upgrade my PHP from 5.1.6 to 5.2.10 yesterday on my CentOS 5.3 + ISPConfig 2.2.32 box using this tutorial:...
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