ldap_explode_dn() function is
used to split the DN returned by
ldap_get_dn() and breaks it up into its component
parts. Each part is known as Relative Distinguished Name, or
RDN. ldap_explode_dn() returns an
array of all those components.
with_attrib is used to request if the RDNs are
returned with only values or their attributes as well. To get
RDNs with the attributes (i.e. in attribute=value format) set
with_attrib to 0 and to get
only values set it to 1.