Description:

PHP is an HTML-embedded scripting language. PHP attempts to make it
easy for developers to write dynamically generated web pages. PHP
also offers built-in database integration for several commercial
and non-commercial database management systems, so writing a
database-enabled web page with PHP is fairly simple. The most
common use of PHP coding is probably as a replacement for CGI
scripts.
Using PHP as a CGI binary is an option for setups that for some reason
do not wish to integrate PHP as a module into server software (like Apache),
or will use PHP with different kinds of CGI wrappers to create safe
chroot and setuid environments for scripts.
This setup usually involves installing executable PHP binary to the
web server cgi-bin directory. CERT advisory CA-96.11 recommends
against placing any interpreters into cgi-bin.