PHP5 is now available on the webserver to be optionally enabled by the end-user.
PHP4 will remain the default PHP until its End Of Life this December. We will then switch to PHP5 full-time as the default. Please use this time to confirm that all of your PHP scripts are compatible with PHP5. This likely will not be an issue, but we feel it is best to provide this interim period where both versions are available. We will likely offer PHP4 as a secondary PHP for some time after the switch in the same manner that we’re offering PHP5 now.
Again, please use the rest of this year to ensure compatibility of PHP5 with user-installed software by testing PHP5 wherever necessary.
PHP5 will be the processor for files with the extension .php5 automatically. To enable PHP5 for processing of .php files you only need add a single line to your .htaccess.
AddHandler application/x-httpd-php5 .php
PHP5, as mentioned, processes through the CGI interface, versus being an Apache module, it may be slightly slower as a result, but otherwise the configurations are identical.