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You have installed the php4 package.

Have a look at the php4 port if you need additional extensions other than
CTYPE, MYSQL, OVERLOAD, PCRE, POSIX, SESSION, TOKENIZER, XML and ZLIB.

You can find it at
ftp://ftp.freebsd.org/pub/FreeBSD/FreeBSD-current/ports/lang/php4.tar

Make sure index.php is part of your DirectoryIndex.

You should add the following to your Apache configuration file:

AddType application/x-httpd-php .php
AddType application/x-httpd-php-source .phps

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