檢查下拉列表是否被選中 - Wordpress

Question

如果未選擇drop_artists，我想要$answer設置爲artist_name。我也試過if(isset($_POST['drop_artists'])) {，但沒有運氣。我究竟做錯了什麼？

if($_POST['drop_artists'] != '') { 
      $answer = $_POST['drop_artists']; 
     }else{ 
      $answer = $_POST['artist_name']; 
     } 

而且形式：

<form method="post" action="" id="artists-form"> 

     <?php 
     $args = array(
      'show_option_all' => 'Artists', 
      'hierarchical' => 1, 
      'child_of' => 406, 
      'orderby' => 'name', 
      'name' => 'drop_artists', 
      'hide_empty' => 0 
     ); 
     wp_dropdown_categories($args); ?> 

<h3 class="widget-title">Can't find the artist? Fill in below:</h3> 

<input type="text" name="artist_name" value="" size="45" id="input-title"/> 

<input id="submitButton" class="subput" type="submit" name="submit" value="Submit"/> 
</form> 

Answer 1

支票$_POST['drop_artists'] != 0