function create_tree($user,$pass){
                $connection=ldap_connect('10.0.1.253','389');
                ldap_set_option($connection, LDAP_OPT_PROTOCOL_VERSION, 3);
                if($connection){
                        $bind = ldap_bind($connection, $user, $pass);
                        $read=ldap_search($connection,"ou=Nuestra_Capital,dc=local,dc=com,dc=mx","(ou=*)") or exit("Create tree function unable to search!");
                        $info=ldap_get_entries($connection,$read);
                        $tree=array();
                        for($i=0;$i<$info['count'];$i++){
                                $parent=explode(',',$info[$i]['dn']);
                                if(count($parent)==5){
                                        //headers
                                        $nam=explode("=",$parent[0]);
                                        $tree[$nam[1]]='';
                                        echo "im a head: ".$nam[1].'<br/>';
                                }else{
                                        //$tree[$nam[1]][]=$info[$i]['dn'];
                                        $k=count($parent)-4;
                                        do{
                                                $child=explode('=',$parent[$k]);
                                                if($child[1]!='Nuestra_Capital'){
                                                        if(array_key_exists($child[1],$tree) || array_key_exists($nam[1],$tree[$child[1]])){
                                                                $ex=explode(",",$info[$i]['dn']);
                                                                $res=(count($ex)-1)-$k;
                                                                $tot=((count($ex)-1)-$res);
                                                                $str=explode("=",$ex[$tot-$k]);
                                                                $father=explode("=",$ex[($tot-$k)+1]);

                                                                //echo "original : ".$info[$i]['dn'].'<br/>';
                                                                //echo "parsed ".$k." : ".$child[1].'<br/>';
                                                                echo "key exists: ".$child[1].'<br/>';
                                                                echo "value to be added: ".$str[1].' ?</br>';
                                                                $tree[$child[1]][]=$str[1];
                                                        }else{
                                                                //echo "original: ".$info[$i]['dn'].'<br/>';
                                                                //echo "parsed ".$k.": ".$child[1].'<br/><br/><br/>';
                                                                //$tree[$nam[1]][$father]=$nam[1];
                                                                $tree[$child[1]]='';
                                                        }
                                                }
                                                $k--;
                                        }while($k>=0);
                                }
                        }
                }
                ldap_close($connection);
                echo "==================== Array =====================<br/><pre>";
                echo var_dump($tree);
                echo "</pre>";
                //return $tree;
}

Desired Result :

array(20) {
  ["IT_Admins"]=>
  string(0) ""
  ["Grupos"]=>
  string(0) ""
  ["usuarios_Generales"]=>
  string(0) ""
  ["Presidencia"]=>
  array(2) {
    [0]=>
    string(21) "Secretaria_Particular"
    [1]=>
    string(19) "Oficialia_de_Partes"
  }
  ["Sindicatura"]=>
  string(0) ""
  ["Direccion_de_administracion"]=>
  array(5) {
    [0]=>
    string(11) "Informatica"
    [1]=>
    string(29) "DEPARTAMENTO_DE_ADQUISICIONES"
    [2]=>
    string(33) "Departamento_de_Control_Vehicular"
    [3]=>
    string(56) "Departamento_de_Servicios_Generales_y_Eventos_Especiales"
    [4]=>
    string(50) "Departamento_de_Control_de_Almacenes_e_Inventarios"
  }
  ["Tesoreria"]=>
  array(6) {
    [0]=>
    string(20) "Direccion_de_Egresos"
    [1]=>
    string(21) "Direccion_de_Ingresos"
	array(3){
	    [0]=>
		    string(12) "test_failure" =>
			array(1){
				    [0]=>
				    	string(16) "testing_failure2" =>
					array(1){
							    [0]=>
								   string(16) "testnig_failure3"

					}
			}
	}
    [2]=>
    string(48) "Direccion_de_Contabilidad_y_Control_Presupuestal"
  }
}