<?php
$username = $_POST['username'];
$pass = $_POST['password'];
$subtree = 'dc=iitb,dc=ac,dc=in';
$conn = ldap_connect("ldap://ldap.iitb.ac.in");
$filter = "(uid=".$username.")";
if ($username){
    if ($conn){
        $search = ldap_search($conn, $subtree, $filter);
        $result = ldap_get_entries($conn, $search);
    	$ldapbind = ldap_bind($conn, $result[0]["dn"], $pass);
    	if ($ldapbind){
    	    echo "Successfully Authenticated";
    		return true;
    	} else{
    	    echo "Invalid Credentials";
    		return false;
    	}
    } else {
        echo "Could not connect to ldap server";
    	return false;
    }
} else{
    echo "Make sure you provide the credentials";
    return false;
}
?>