php - Call to undefined function inval() -


i have error in my_model in codeigniter. i've looked everywhere nothing my_model:

<?php if ( ! defined('basepath')) exit('no direct script access allowed');      class my_model extends ci_model     {     protected $_table_name = '';     protected $_primary_key = 'id';     protected $_primary_filter = 'intval';     protected $_order_by = '';     protected $_rules = array();     protected $_timestamps = false;     function __construct(){         parent::__construct();         $this->load->database();     }     public function get($id = null, $single = false)     {         if ($id != null)         {                $filter = $this->_primary_filter;             $id = $filter($id);             $this->db->where($this->_primary_key,$id);             $method = 'row';         }         elseif($single == true)         {             $method = 'row';         }         else         {             $method = 'result';         }            if(!count($this->db->ar_orderby))         {             $this->db->order_by($this->_order_by);           }         return $this->db->get($this->_table_name)->$method();     }     public function get_by($where, $single = false)     {         $this->db->where($where);         return $this->get(null, $single);     }     public function save($data, $id = null)     {         //set timestamp         if($this->_timestamps == true)         {             $now = date('y-m-d h:i:s');             $id || $data['created'] = $now;             $data['modified'] = $now;         }         //insert         if ($id ===null)         {             !isset($data[$this->_primary_key]) || $data[$this->_primary_key] = null;             $this->db->set($data);             $this->db->insert($this->_table_name);             $id = $this->db->insert_id();         }         //update         else         {             $filter = $this->_primary_filter;             $this->db->set($data);             $this->db->where($this->_primary_key,$id);             $this->db->update($this->_table_name);         }         return $id;     }     public function delete($id)     {         $filter = $this->_primary_filter;         $id = $filter($id);         $this->db->where($this->_primary_key,$id);         $this->db->limit(1);         $this->db->delete($this->_table_name);     }  } ?>

and in controller call function in way:

public function delete()     {         $this->page_m->delete(3);     }

when write:cms/page/delete...the error is:

fatal error: call undefined function inval() in c:\xampp\htdocs\application\core\my_model.php on line 75

help me please

i think problem in delete() function 

$filter = $this->_primary_filter; $id = $filter($id);

make sure receive correct id , type (int, bool)


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