This is what I wrote to enable php in MacOS X:

sudo echo "LoadModule php4_module        libexec/httpd/libphp4.so" >> /etc/httpd/httpd.conf
sudo echo "AddModule mod_php4.c" >> /etc/httpd/httpd.conf
sudo echo "<IfModule mod_php4.c>" >> /etc/httpd/httpd.conf
sudo echo "	AddType application/x-httpd-php .php .php4 .php3 .phtml" >> /etc/httpd/httpd.conf
sudo echo "	AddType application/x-httpd-php-source .phps" >> /etc/httpd/httpd.conf
sudo echo "</IfModule>" >> /etc/httpd/httpd.conf
sudo echo "DirectoryIndex index.html index.htm index.shtml index.php index.php4 index.php3 index.phtml index.cgi" >> /etc/httpd/httpd.conf

Gjermund G. Thorsen