php - CodeIgniter: blank page when a model contains a function -

i'm using codeigniter website project. when include model, work long no function implemented (except constructor).

this configuration works:

class xyz_model extends ci_model {      function __construct() {      } } 

this doesn't:

class xyz_model extends ci_model {      function __construct() {      }      public function get_xyz() {         return [                     "xy" => ["xy"],             "yz" => ["xy"],             "zz" => ["xy","zx","zy"]         ];     } } 

there not database access... , have no clue why not working.

you extending core model class, child's constructor being used in placed of parents:

parent::__construct(); 

add models constructor.