在函数widget()中,您将看到显示输入值的循环.

<?PHP
/*
Plugin Name: Dynamic Fields Widget
Description: Dynamic Fields
Version: 0.0
Author: Rain Man
*/
// Creating the widget
class dynamic_widget extends WP_Widget
{
    public $courses;
    public function __construct()
    {
        parent::__construct(
          // Base ID of your widget
          'dynamic_widget','dynamic_widget_domain'))
        );
        $this->courses = array(
          'Chemistry'    => array(
            'coursecode'   => 'Chemistry 2059','Biology'   => array(
            'coursecode'   => 'Biology 3029','Math' => array(
            'coursecode'   => 'Math 2043','Physics'  => array(
            'coursecode'   => 'Physics 2075',)
        );
        add_action( 'in_admin_footer',array( $this,'jsfooter'));
    }
    public function jsfooter() {
    ?>
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.4/jquery.min.js"></script>

    <script type="text/javascript">
    jQuery(document).ready(function( $){
        $(document ).off('click').on('click','div.open .add-row',function() {

        var row = $(this).closest('tr').clone(true);
        row.find('input').each(function(){
            $(this).val("");
        });
        // row.insertBefore( '#repeatable-fieldset-one tbody>tr:last' );
        $(this).parents('tr').after(row);

        return false;
      });

      $( document).on('click','div.open .remove-row',function() {
          if ($(this).parents('tbody').find('tr').length >1) {
            $(this).parents('tr').remove(); 
        }
        return false;
      });
    });
    </script>
    <?PHP
    }

// widget
public function widget($args,$instance['title']);
// This is where you run the code and display the output
    foreach ($this->courses as $course_key => $course_info) {
        echo $course_info['coursecode'] .'<br>'; 
        foreach ($instance['repeat'][$course_key ]["fall"] as $k=>$field) {
            echo 'Fall Term ' . $field .' / ';
            echo 'Winter Term ' . $instance['repeat'][$course_key ]["winter"][$k] .'<br>';
        }
    }

    echo $args['after_widget'];
}

// form
public function form($instance)
{
    if (isset($instance[ 'title' ])) {
        $title = $instance[ 'title' ];
    } else {
        $title = __('New title','dynamic_widget_domain');
    }
// Widget admin form
    $repeatable_fields= isset ( $instance['repeat'] ) ? $instance['repeat'] : array();
     ?>

<?PHP foreach ($this->courses as $course_key => $course_info) { ?>
<label><?PHP echo $course_info['coursecode']; ?></label>
<table id="repeatable-fieldset-one" width="100%">
<thead>
  <tr>
    <th width="40%">Fall Term</th>
    <th width="40%">Winter Term</th>
    <th width="8%"></th>
    <th width="8%"></th>
  </tr>
</thead>
<tbody>
<?PHP

if ($repeatable_fields[$course_key ]["fall"] || $repeatable_fields[$course_key ]["winter"]) :
foreach ($repeatable_fields[$course_key ]["fall"] as $k=>$field) {
    ?>
<tr>
  <td><input type="text" class="widefat" name="<?PHP echo $this->get_field_name( 'repeat' )?>[<?PHP echo $course_key;?>][fall][]" value="<?PHP echo $field; ?>" /></td>

  <td><input type="text" class="widefat" name="<?PHP echo $this->get_field_name( 'repeat' )?>[<?PHP echo $course_key;?>][winter][]" value="<?PHP echo $repeatable_fields[$course_key ]["winter"][$k]; ?>" /></td>

  <td><a class="button remove-row" href="#">Remove</a></td>
  <td><a class="button add-row" class="button" href="#">Add</a></td>

</tr>
<?PHP
} else :
// show a blank one

?>
<tr>
  <td><input type="text" class="widefat" name="<?PHP echo $this->get_field_name( 'repeat' )?>[<?PHP echo $course_key;?>][fall][]" /></td>


  <td><input type="text" class="widefat" name="<?PHP echo $this->get_field_name( 'repeat' )?>[<?PHP echo $course_key;?>][winter][]" value="" /></td>

  <td><a class="button remove-row" href="#">Remove</a></td>
  <td><a class="button add-row" class="button" href="#">Add</a></td>

</tr>
<?PHP endif; ?>
</tbody>
</table>
<?PHP } ?>


<!-- empty hidden one for jQuery -->

<?PHP

}

// update
public function update($new_instance,$old_instance)
{
    $instance = array();
    $instance['title'] = (!empty($new_instance['title'])) ? strip_tags($new_instance['title']) : '';
    $instance['repeat'] = array();

    if ( isset ( $new_instance['repeat'] ) )
    {
        foreach ( $new_instance['repeat'] as $k =>$value )
        {
                $instance['repeat'][$k] = $value;
        }
    }

    return $instance;
}
} // Class dynamic_widget ends here

// Register and load the widget
function wpb_load_widget()
{
    register_widget('dynamic_widget');
}
add_action('widgets_init','wpb_load_widget');

数据将存储在$instance [‘repeat“]中的数组中(以了解我是如何创建循环的)

array (size=4)
  'Chemistry' => 
    array (size=2)
      'fall' => 
        array (size=1)
          0 => string 'AAA' (length=3)
      'winter' => 
        array (size=1)
          0 => string 'BBBBBBB' (length=7)
  'Biology' => 
    array (size=2)
      'fall' => 
        array (size=2)
          0 => string 'CCCCCC' (length=6)
          1 => string 'EEEEEEE' (length=7)
      'winter' => 
        array (size=2)
          0 => string 'DDDD' (length=4)
          1 => string 'FFFFFFFF' (length=8)
  'Math' => 
    array (size=2)
      'fall' => 
        array (size=1)
          0 => string 'GGGGGGG' (length=7)
      'winter' => 
        array (size=1)
          0 => string 'HHHHHH' (length=6)
  'Physics' => 
    array (size=2)
      'fall' => 
        array (size=1)
          0 => string 'IIIIIIIII' (length=9)
      'winter' => 
        array (size=1)
          0 => string 'JJJJJJJJ' (length=8)