title: How to modify/add a new objectClass to an entry in OpenLDAP php
body: <p>I have an entry in the AD(Active Directory) which has only <strong>person</strong> objectclass with attributes of cn and sn.
  Now I want to add one more objectclass of <strong>organizationalPerson</strong> to insert <strong>postalCode</strong> attribute using <strong>LDAP</strong>.</p>
  
  <p>I am new to LDAP, please help me.</p>
  
  <p>Thanks in advance.</p>