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At the most basic level, PHP can do anything any other CGI program can do, such as collect form data,
generate dynamic page content, or send and receive cookies.
Perhaps the strongest and most significant feature in PHP is its support for a wide range of databases.
Writing a database-enabled web page is incredibly simple. The following databases are currently
supported:
Adabas D InterBase Solid
dBase mSQL Sybase
Empress MySQL Velocis

FilePro Oracle Unix dbm
Informix PostgreSQL
PHP also has support for talking to other services using protocols such as IMAP, SNMP, NNTP, POP3,
or even HTTP. You can also open raw network sockets and interact using other protocols