Installing PHP 5 as a CGI is a quick way to get up and running without sacrificing PHP 4. This section describes two techniques for making PHP 5 parse your code, instead of PHP 4.
Remember that the CGI version
of PHP has a few limitations compared to the Apache module version.
It cannot hook into HTTP Basic Authentication, nor can you read and
write internal Apache values using functions such as
One option is to enable PHP 5 on a directory-by-directory basis. This lets the PHP 4 module handle scripts by default, but lets you slowly release PHP 5 code when it’s ready.
The second alternative is to enable PHP 5 for all files but on another port. By default, Apache listens for requests on port 80, so normal requests are still handled as usual. However, whenever a request is made to your site on port 8080, Apache now hands the script off to PHP 5. With this setup, you can easily get a complete overview of your PHP 5 compatibility without sacrificing PHP 4 support.
This process breaks down into two main parts: configuring PHP 5 and configuring Apache. The PHP 5 configuration is identical for either Apache setup, so you can easily switch between the two.
Installing PHP 5 as a CGI requires four additional steps beyond your normal configuration:
PHP defaults to a CGI installation, but it won’t build it when you specify a web server ...