问Wordpress Post格式下拉列表为空

EN

function mytheme_enable_theme_support(){
  $options = get_option('post_formats');
  $formats = array('aside', 'gallery', 'link', 'image', 'quote', 'status', 'video', 'audio', 'chat');
  $output = array();
  foreach($formats as $format){
    if (isset($options[$format])){
      $output[] = $format;
    }
  }
  if(!empty($options)){
    add_theme_support('post-formats', $output);
  }
}
add_action('after_setup_theme', 'mytheme_enable_theme_support');

  if(!empty($options)){
    debug(print_r($output,true)."\n");
    debug(print_r($options,true)."\n");
    add_theme_support('post-formats', $output);
  }

Array ($output)
(
    [0] => gallery
    [1] => video
    [2] => audio
)

Array ($options)
(
    [gallery] => 1
    [video] => 1
    [audio] => 1
)

//enable the post formats chosen in the theme settings
function mytheme_enable_theme_support(){
  $options = get_option('post_formats'); 
  /* if the option 'post_format' is found in the DB, creates an arrray of what it contains
     in my case, that array looks like this:

     Array (
         [gallery] => 1
         [video] => 1
         [audio] => 1
     )     

     if the option is not found, $options will contain NULL.
  */
  
  $formats = array('aside', 'gallery', 'link', 'image', 'quote', 'status', 'video', 'audio', 'chat');
  /* here we initialize a temporary variable with all the supported post formats. This is so that we 
     can use it below to build an array of just the ones configured. There are likely better ways to 
     do this but this works.

  */
  
  $output = array(); //initialize $output as an empty array
  
  foreach($formats as $format){
    /* loop through the $formats array defined above. This loop will execute 9 times.
       each time it executes $format will contain the next string in the sequence 
       ('aside', 'gallery', 'link', etc.)
    */
    if (isset($options[$format])){
      /* this if statement checks to see if the current $format string exists as a key in the $options
      array. 
        if (isset($options['aside']))
        if (isset($options['gallery']))
        if (isset($options['link']))
        if (isset($options['image']))
        etc.
      */  
      
      $output[] = $format;
      /* if it does, this assignment pushes the current format string onto the $output array. 
      $output[] = $format; is equivalent to array_push($output, $format);
      See https://www.php.net/manual/en/function.array-push.php for details.
      */
    }
    // $output[] = ( @$options[$format] == 1 ? $format : ''); // '@' is shorthand for 'isset()'
  }
  if(!empty($options)){
    // when we're all done, if we have any elements in the $options array... 

    debug(print_r($output,true)."\n");
    debug(print_r($options,true)."\n");
    // configure the theme to support them
    add_theme_support('post-formats', $output);
  }