The php-imap package contains a dynamic shared object (DSO) for the
Apache Web server. The php-imap module, when compiled into Apache,
that will add IMAP (Internet Message Access Protocol) support to
PHP3. IMAP is a protocol for retrieving and uploading e-mail messages
on mail servers. PHP is an HTML-embedded scripting language for use
with Apache. If you need IMAP support for PHP3 applications, you will
need to install this package and PHP3.