php - Error:must implement interface Zend\Stdlib\Hydrator\HydratorInterface -

i following https://zf2-docs.readthedocs.org/en/latest/in-depth-guide/zend-db-sql-zend-stdlib-hydrator.html

here code

zenddbsqlmapper.php

namespace blog\mapper;  use blog\model\postinterface; use zend\db\adapter\adapterinterface; use zend\db\adapter\driver\resultinterface; use zend\db\resultset\resultset; use zend\db\resultset\hydratingresultset;  use zend\db\sql\sql; use zend\stdlib\hydrator\hydratorinterface;  class zenddbsqlmapper implements postmapperinterface{     protected $dbadapter;     protected $hydrator;     protected $postprototype;     public function __construct(adapterinterface $dbadapter,hydratorinterface $hydrator,postinterface $postprototype) {      $this->dbadapter = $dbadapter;     $this->hydrator = $hydrator;     $this->postprototype = $postprototype;  }  public function find($id){  }  public function findall() {     $sql = new sql($this->dbadapter);     $select = $sql->select('posts');      $stmt = $sql->preparestatementforsqlobject($select);      $result = $stmt->execute();        if($result instanceof resultinterface && $result->isqueryresult())     {          $resultset = new hydratingresultset($this->hydrator,$this->postprototype);           return $resultset->initialize($result);     }       return array();     }   } 

zenddbsqlmapperfactory.php

namespace blog\factory;  use blog\mapper\zenddbsqlmapper; use blog\model\post; use zend\servicemanager\factoryinterface; use zend\servicemanager\servicelocatorinterface; use zend\stdlib\hydrator\classmethods;     class zenddbsqlmapperfactory implements factoryinterface{      public function createservice(servicelocatorinterface $servicelocator) {     return new zenddbsqlmapper($servicelocator->get('zend\db\adapter\adapter',new classmethods(false),new post()));    }       } 

module.config.php

 'service_manager'=>array(      'factories'=>array(         'blog\mapper\postmapperinterface'=>'blog\factory\zenddbsqlmapperfactory',         'blog\service\postserviceinterface'=>'blog\factory\postservicefactory',         'zend\db\adapter\adapter'=>'zend\db\adapter\adapterservicefactory'     ) ), 

problem:

it showing error like

catchable fatal error: argument 2 passed blog\mapper\zenddbsqlmapper::__construct() must implement interface zend\stdlib\hydrator\hydratorinterface, none given, called in /var/www/zend2/module/blog/src/blog/factory/zenddbsqlmapperfactory.php on line 16 , defined in /var/www/zend2/module/blog/src/blog/mapper/zenddbsqlmapper.php on line 21

i not understand why not detecting hydratorinterface.is deprecated https://github.com/zendframework/zend-stdlib/issues/25

i using zend framework 2.3.3

you forgot bracket when constructing zenddbsqlmapper instance, why second , third parameter aren't passed.

here go wrong:

return new zenddbsqlmapper($servicelocator->get('zend\db\adapter\adapter',new classmethods(false),new post()));                                                                          <-- ) missing                       <-- ) many 

try this:

return new zenddbsqlmapper(     $servicelocator->get('zend\db\adapter\adapter'),     new classmethods(false),     new post() );