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  1. add_action( 'restrict_manage_posts', 'acs_admin_posts_filter_restrict_manage_posts' );
  2. /**
  3.  * First create the dropdown
  4.  * make sure to change POST_TYPE to the name of your custom post type
  5.  *
  6.  * @author Ohad Raz
  7.  *
  8.  * @return void
  9.  */
  10. function acs_admin_posts_filter_restrict_manage_posts(){
  11.     $type = 'contestentry';
  12.     if (isset($_GET['post_type'])) {
  13.         $type = $_GET['post_type'];
  14.     }
  15.  
  16.     //only add filter to post type you want
  17.     if ('contestentry' == $type){
  18.         //change this to the list of values you want to show
  19.         //in 'label' => 'value' format
  20.         $values = array(
  21.                         'Cow' => 'Cow',
  22.                         'Goat' => 'Goat',
  23.                         'Sheep' => 'Sheep',
  24.                         'Cow-Goat' => 'Cow-Goat',
  25.                         'Cow-Sheep' => 'Cow-Sheep',
  26.                         'Cow-Goat-Sheep' => 'Cow-Goat-Sheep',
  27.                         'Goat-Sheep' => 'Goat-Sheep',
  28.                         'Water Buffalo' => 'Water Buffalo',
  29.                         'Mixed' => 'Mixed'
  30.         );
  31.         ?>
  32.         <select name="ADMIN_FILTER_FIELD_VALUE">
  33.         <option value=""><?php _e('Filter By ', 'acs'); ?></option>
  34.         <?php
  35.             $current_v = isset($_GET['ADMIN_FILTER_FIELD_VALUE'])? $_GET['ADMIN_FILTER_FIELD_VALUE']:'';
  36.             foreach ($values as $label => $value) {
  37.                 printf
  38.                     (
  39.                         '<option value="%s"%s>%s</option>',
  40.                         $value,
  41.                         $value == $current_v? ' selected="selected"':'',
  42.                         $label
  43.                     );
  44.                 }
  45.         ?>
  46.         </select>
  47.         <?php
  48.     }
  49. }
  50.  
  51.  
  52. add_filter( 'parse_query', 'acs_posts_filter' );
  53. /**
  54.  * if submitted filter by post meta
  55.  *
  56.  * make sure to change META_KEY to the actual meta key
  57.  * and POST_TYPE to the name of your custom post type
  58.  * @author Ohad Raz
  59.  * @param  (wp_query object) $query
  60.  *
  61.  * @return Void
  62.  */
  63. function acs_posts_filter( $query ){
  64.     global $pagenow;
  65.     $type = 'post';
  66.     if (isset($_GET['post_type'])) {
  67.         $type = $_GET['post_type'];
  68.     }
  69.     if ( 'contestentry' == $type && is_admin() && $pagenow=='edit.php' && isset($_GET['ADMIN_FILTER_FIELD_VALUE']) && $_GET['ADMIN_FILTER_FIELD_VALUE'] != '') {
  70.         $query->query_vars['meta_key'] = 'ecpt_sourceofmilk';
  71.         $query->query_vars['meta_value'] = $_GET['ADMIN_FILTER_FIELD_VALUE'];
  72.     }
  73. }
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