WordPress: Get the select field option choices in ACF (Advanced Post Field) plugin?

3 comments

1. Finally, after all, I found a reliable solution to get around this question:

   You can first see the api_acf_load_field function in the source code:

   add_filter('acf/load_field', 'api_acf_load_field', 1, 2);
   function api_acf_load_field( $field, $field_key )
   {
       // validate
       if( !empty($GLOBALS['acf_register_field_group']) )
       {
           foreach( $GLOBALS['acf_register_field_group'] as $acf )
           {
               if( !empty($acf['fields']) )
               {
                   foreach( $acf['fields'] as $f )
                   {
                       var_dump($f['key']);
                       if( $f['key'] == $field_key )
                       {
                           $field = $f;
                           break;
                       }
                   }
               }
           }
       }
   
       return $field;
   }
   

   We can just iterate through all registered fields to pick the correct one.

   But the $GLOBALS['acf_register_field_group'] is there only when we call register_field_group explicitly (Case 2 below). Or in the normal case (Case 1 below), we can’t got it in this way.

   So see the different cases:

   ---

   Case 1: When the field groups are defined in the admin panel (in the database):

   function get_field_choices($field_name, $multi=false) {
       $results = array();
       foreach (get_posts(array('post_type' => 'acf', 'posts_per_page' => -1)) as $acf) {
           $meta = get_post_meta($acf->ID);
           foreach($meta as $key => $field) {
               if(substr($key, 0, 6) == 'field_') {
                   $field = unserialize($field[0]);
                   if($field['name'] == $field_name && isset($field['choices'])) {
                       if(!$multi) return $field['choices'];
                       else $results []= $field;
                   }
               }
           }
       }
       return $results;
   }
   

   In this case, the field groups are store as post which post type is acf, and the field information are stored as post_meta of that field group.

   So, we grab all the fields registered (from database), and pick the correct one(s).

   ---

   Case 2: When register_field_group explicitly, like using the export php scripts in the functions.php:

   function get_field_choices($field_name, $multi=false) {
       $results = array();    $results = array();
       foreach($GLOBALS['acf_register_field_group'] as $acf) {
           foreach($acf['fields'] as $field) {
               if(substr($field['key'], 0, 6) == 'field_') {
                   if($field['name'] == $field_name && isset($field['choices'])) {
                       if(!$multi) return $field['choices'];
                       else $results []= $field;
                   }
               }
   
           }
       }
       return $results;
   }
   

   ---

   Then we finally got a always work function:

   function get_field_choices($field_name, $multi=false) {
       $results = array();
       foreach($GLOBALS['acf_register_field_group'] as $acf) {
           foreach($acf['fields'] as $field) {
               if(substr($field['key'], 0, 6) == 'field_') {
                   if($field['name'] == $field_name && isset($field['choices'])) {
                       if(!$multi) return $field['choices'];
                       else $results []= $field;
                   }
               }
   
           }
       }
       foreach (get_posts(array('post_type' => 'acf', 'posts_per_page' => -1)) as $acf) {
           $meta = get_post_meta($acf->ID);
           foreach($meta as $key => $field) {
               if(substr($key, 0, 6) == 'field_') {
                   $field = unserialize($field[0]);
                   if($field['name'] == $field_name && isset($field['choices'])) {
                       if(!$multi) return $field['choices'];
                       else $results []= $field;
                   }
               }
           }
       }
       return $results;
   }
   

2. Not sure why get_field_object always return false, and the answer I voted before not working any more, so I have to work out a new solution, I guess maybe ACF updated how data store, custom field now store in wp_post table, post type is acf-field.

   function get_field_choices($field_name, $multi = false) {
     $results = array();
     foreach (get_posts(array('post_type' => 'acf-field', 'posts_per_page' => -1)) as $acf) {
       if ($acf->post_excerpt === $field_name) {
         $field = unserialize($acf->post_content);
         if(isset($field['choices'])) {
           if(!$multi) return $field['choices'];
           else $results []= $field;
         }
       }
     }
     return $results;
   }
   

3. On ACFs site they state:

   “The API will return the selected value. If you select the multiple option for this field, the API will return an array of values.”

   So try the following:

   // get the selected value
   $value = get_field('time_availability');
   ?>
   
   <ul>
     <li><input type="radio" name="low" <?php echo ($value == 'low'?'checked="checked"':''); ?>/> Once or twice</li>
     <li><input type="radio" name="high" <?php echo ($value == 'high'?'checked="checked"':''); ?>/> Several times</li>
   </ul>
   

   If you have enabled the selection of multiple values, you should use checkboxes instead of radios.

   ---

   To access the available choices, you have to get the field object.

   // choose the field
   $field_name = 'time_availability';
   $field = get_field_object($field_name);
   
   if( $field )
   {
       // build the form
       echo '<select name="' . $field['key'] . '">';
           foreach( $field['choices'] as $k => $v )
           {
               echo '<option value="' . $k . '">' . $v . '</option>';
           }
       echo '</select>';
   }
   

   ---

   To get the field object from a user, use this notation:

   $user_id = 2;  // the id of the user
   $field_name = 'your_field';  // the name of the field
   get_field_object($field_name, 'user_.'.$user_id)
   

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