php - Wordpress - Passing a class method to the query_var hook -

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i have following code in wordpress try , achive stage can use esc_url(get_permalink() . '?month=' . get_query_var('month'));.

in attempt learn more wordpress , make class allow me add more values , when need them, created following class , linked query_vars filter:

 //create needed vars //   $custom_query_values = array('month','day');   new _custom_query_vars($custom_query_values);   class _custom_query_vars  {      public $_custom_vars;      function __construct($custom_vars){         $this->_custom_vars = $custom_vars;         add_filter('query_vars',array(&$this, '_add_custom_querys'));     }      public function _add_custom_querys(){     // return array of values //         foreach($this->_custom_vars $value)         {             $vars[] = $value;         }          print_r($vars);         return $vars;      }  }    /*function add_custom_query_var( $vars ){    $vars[] = "month";    $vars[] = "day";    return $vars;  }  add_filter( 'query_vars', 'add_custom_query_var' ); */

the above code not work, instead, when class active , when create new instance pages on website stop working , simple directed root address. however, function "seems" working print_r() indeed print values of array ( [0] => month [1] => day ) method must getting passed query_var hook in shape or form.

the second part of code commented out me trying standard function returns static values. works , using normal esc_url(get_permalink() . '?month=' . get_query_var('month')); works expected. ideas? (one last thing, there way of making http://www.sitename/pagename/month).

thank , help,

i not sure try this.

public function _add_custom_querys(){          $vars =  array();           foreach($this->_custom_vars $value){              array_push($vars,$value);          }           return $vars; }

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