PHP LDAP Part 2

<?php
	
	$ldap_dn = "cn=read-only-admin,dc=example,dc=com";
	$ldap_password = "password";
	
	$ldap_con = ldap_connect("ldap.forumsys.com");
	
	ldap_set_option($ldap_con, LDAP_OPT_PROTOCOL_VERSION, 3);
	
	if(ldap_bind($ldap_con, $ldap_dn, $ldap_password)) {

		$filter = "(cn=Albert Einstein)";
		$result = ldap_search($ldap_con,"dc=example,dc=com",$filter) or exit("Unable to search");
		$entries = ldap_get_entries($ldap_con, $result);
		
		print "<pre>";
		print_r ($entries);
		print "</pre>";
	} else {
		echo "Invalid user/pass or other errors!";
	}
	
	
?>

Hi, is it possible to filter two user ? $filter = Einstein and Tesla for example ?
Best regards