:: How to compile PHP 5.3 in DirectAdmin
+ go to custombuild

cd /usr/local/directadmin/custombuild

+ configure options.conf file

vi options.conf
# change on this line:
php5_ver=5.3

+ compiling php 5.3

./build update
./build php n

+ checking

$ php -v
PHP 5.3.19 (cli) (built: Dec  6 2012 16:00:25)
Copyright (c) 1997-2012 The PHP Group
Zend Engine v2.3.0, Copyright (c) 1998-2012 Zend Technologies

:: Link
+ Google
+ iprobot