单击更新后，未保存第二个选择列表值

我在元数据库中有一个选择列表，在编辑帖子时单击“更新”后，该列表的值被成功保存。当然，这些值是自定义分类法。But i don\'t know how to add another select list and make it save its values successfully too...

add_action( \'add_meta_boxes\', \'so_custom_meta_box\' );

function so_custom_meta_box($post){
add_meta_box(\'so_meta_box\', \'Reproductor 1\', \'custom_element_grid_class_meta_box\',     $post->post_type, \'normal\' 

, \'high\');
}

add_action(\'save_post\', \'so_save_metabox\');

function so_save_metabox(){ 
global $post;

if(isset($_POST["custom_element_grid_class"])){
     //UPDATE: 
    $meta_element_class = $_POST[\'custom_element_grid_class\'];
    //END OF UPDATE

    update_post_meta($post->ID, \'custom_element_grid_class_meta_box\',   $meta_element_class);
    //print_r($_POST);
}
}

function custom_element_grid_class_meta_box($post){
$meta_element_class = get_post_meta($post->ID, \'custom_element_grid_class_meta_box\', true); ?>   

  <select name="custom_element_grid_class" id="custom_element_grid_class">
  <option value="Netu" <?php selected( $meta_element_class, \'Netu\' ); ?>>Netu</option>
  <option value="Netu-latino" <?php selected( $meta_element_class, \'Netu-latino\' ); ? >>Netu Latino</option>
  <option value="Netu-castellano" <?php selected( $meta_element_class, \'Netu- castellano\' ); ?>>Netu Castellano</option>
  <option value="Netu-vose" <?php selected( $meta_element_class, \'Netu-vose\' ); ?>>Netu    Vose</option>
</select>

  <select name="custom_element_grid_class" id="custom_element_grid_class">
  <option value="Vk" <?php selected( $meta_element_class, \'Vk\' ); ?>>Vk</option>
  <option value="Vk-latino" <?php selected( $meta_element_class, \'Vk-latino\' ); ?>>Vk  Latino</option>
  <option value="Vk-castellano" <?php selected( $meta_element_class, \'Vk-castellano\' );  ?>>Vk Castellano</option>
  <option value="Vk-vose" <?php selected( $meta_element_class, \'Vk-vose\' ); ?>>Vk    Vose</option>
</select>

<?php
}

单击“更新”时，仅保存第一个选择列表值，而不保存第二个。我已经知道这必须是保存代码but i can\'t figure out how to be able to modify it so i can put a second select list and its value can be saved.

add_action( \'add_meta_boxes\', \'so_custom_meta_box\' ); function so_custom_meta_box($post){ add_meta_box(\'so_meta_box\', \'Reproductor 1\', \'custom_element_grid_class_meta_box\', $post->post_type, \'normal\' , \'high\'); } add_action(\'save_post\', \'so_save_metabox\'); function so_save_metabox(){ global $post; if(isset($_POST["custom_element_grid_class"]) && isset($_POST["custom_element_grid_class2"])){ //UPDATE: $meta_element_class = $_POST[\'custom_element_grid_class\']; $meta_element_class2 = $_POST[\'custom_element_grid_class2\']; //END OF UPDATE update_post_meta($post->ID, \'custom_element_grid_class_meta_box\', $meta_element_class); update_post_meta($post->ID, \'custom_element_grid_class_meta_box2\', $meta_element_class2); //print_r($_POST); } } function custom_element_grid_class_meta_box($post){ $meta_element_class = get_post_meta($post->ID, \'custom_element_grid_class_meta_box\', true); $meta_element_class2 = get_post_meta($post->ID, \'custom_element_grid_class_meta_box2\', true); ?> <select name="custom_element_grid_class" id="custom_element_grid_class"> <option value="Netu" <?php selected( $meta_element_class, \'Netu\' ); ?>>Netu</option> <option value="Netu-latino" <?php selected( $meta_element_class, \'Netu-latino\' ); ? >>Netu Latino</option> <option value="Netu-castellano" <?php selected( $meta_element_class, \'Netu- castellano\' ); ?>>Netu Castellano</option> <option value="Netu-vose" <?php selected( $meta_element_class, \'Netu-vose\' ); ?>>Netu Vose</option> </select> <select name="custom_element_grid_class2" id="custom_element_grid_class"> <option value="Vk" <?php selected( $meta_element_class2, \'Vk\' ); ?>>Vk</option> <option value="Vk-latino" <?php selected( $meta_element_class2, \'Vk-latino\' ); ?>>Vk Latino</option> <option value="Vk-castellano" <?php selected( $meta_element_class2, \'Vk-castellano\' ); ?>>Vk Castellano</option> <option value="Vk-vose" <?php selected( $meta_element_class2, \'Vk-vose\' ); ?>>Vk Vose</option> </select> <?php }

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