The differences are in how they are created (what's in spec file)
1 - contentdir
Dan Browns RPMS
%define contentdir /home/e-smith/files/primary
RHX RPMS
%define contentdir /var/www/html
2 - ./configure options
Following options are the SAME
./configure'
'i386-redhat-linux'
'--prefix=/usr'
'--exec-prefix=/usr'
'--bindir=/usr/bin'
'--sbindir=/usr/sbin'
'--sysconfdir=/etc'
'--datadir=/usr/share'
'--includedir=/usr/include'
'--libdir=/usr/lib'
'--libexecdir=/usr/libexec'
'--localstatedir=/var'
'--sharedstatedir=/usr/com'
'--mandir=/usr/share/man'
'--infodir=/usr/share/info'
'--prefix=/usr'
'--with-config-file-path=/etc'
'--enable-force-cgi-redirect'
'--enable-pic'
--disable-debug'
'--disable-rpath'
'--enable-inline-optimization'
'--with-bz2'
'--with-db3'
'--with-exec-dir=/usr/bin'
'--with-freetype-dir=/usr'
'--with-gd'
'--with-gdbm'
'--with-gettext'
'--with-gmp'
'--with-jpeg-dir=/usr'
'--with-mm'
'--with-openssl'
'--with-png'
'--with-xml'
'--with-expat-dir=/usr'
'--with-zlib'
'--with-layout=GNU'
'--enable-bcmath'
'--enable-debugger'
'--enable-ftp'
'--enable-magic-quotes'
'--enable-safe-mode'
'--enable-sockets'
'--enable-sysvsem'
'--enable-sysvshm'
'--enable-discard-path'
'--enable-track-vars'
'--enable-trans-sid'
'--enable-yp'
'--enable-wddx'
'--without-oci8'
--with-imap-ssl'
'--with-kerberos=/usr/kerberos'
'--with-ldap=shared'
'--with-mysql=shared,/usr'
'--with-pgsql=shared'
'--with-snmp=/usr'
'--with-snmp=shared'
'--enable-ucd-snmp-hack'
'--with-unixODBC=shared'
'--enable-memory-limit'
'--enable-bcmath'
'--enable-shmop'
'--enable-versioning'
'--enable-mbstring'
'--with-ttf'
'--with-apxs=/usr/sbin/apxs'
The different options are
in DanBrowns RPMS
'--with-imap=shared,/usr/local/src/imap-2002e'
'--with-dom'
'--with-regex=system'
'--enable-mime-magic'
'--with-iconv'
in RHX RPMS
'--with-imap=shared'
'--enable-calendar'
'--enable-dbx'
'--enable-dio'
'--enable-mcal'
'--enable-mbstr-enc-trans'
'--with-dom=/usr'
'--with-png-dir=/usr'
'--enable-gd-native-ttf'
'--with-ncurses'
'--with-iconv'
'--with-pspell'
'--with-regex=system'
'--enable-exif'
So you can install the PHP RPM which suits your system and/or applications best...
Best rgds, Ergin
PS: Laurent Dinclaux's PHP RPMS had some other options like
--with-curl
--with-mcrypt
--enable-sockets
--enable-pcntl
--enable-sigchild