Reliable Penguin

If you have a server with PHP4 installed but need PHP5 on some websites then:

1. Install a custom build of PHP5 to /opt/php5.

2. Add lines like the following to your apache virtual host:

   AddHandler application/x-httpd-php5 .php 
   ScriptAlias /bin /opt/php51/cgi-bin
   Action application/x-httpd-php5 /bin/php5

You might also find the RemoveHandler directive handy to disable PHP4.

If you need PHP4 on a CentOS5/RHEL5 server then you'll find the RPMs linked below very handy. They install to /opt/php4 and can coexist with a default PHP 5 install.

The included conf.d/php4.conf file includes sample lines to run it as a CGI or as a module.

RPMs are here:
http://repo.conforge.com/conforge/CentOS/5/i386/RPMS/
http://repo.conforge.com/conforge/CentOS/5/x86_64/RPMS/

See this URL for details to add the yum repo:

http://wiki.conforge.com/wiki/Linux-PHP4cgiAndPHP5on+CentOS5