A module for PHP applications that use LDAP

The php-ldap package is a dynamic shared object (DSO) for the Apache
Web server that adds Lightweight Directory Access Protocol (LDAP)
support to PHP. LDAP is a set of protocols for accessing directory
services over the Internet. PHP is an HTML-embedded scripting
language. If you need LDAP support for PHP applications, you will
need to install this package in addition to the php package.