我希望使用Ajax删除密钥[1] 从存储在自定义用户字段中的以下数组中，然后重新保存它。。。

我试图通过使用unset($array[$key]) 然后保存更新的值，但恐怕没有成功。

谢谢你的帮助。。。

Array (

  [0] => Array (
    [dna_cal_when] => 1576926000
    [dna_cal_position_id] => 
    [dna_cal_candidate_id] => 
  )

  [1] => Array (
    [dna_cal_when] => 1576927800
    [dna_cal_position_id] => 
    [dna_cal_candidate_id] => 
  )

  [2] => Array (
    [dna_cal_when] => 1576929600
    [dna_cal_position_id] => 
    [dna_cal_candidate_id] => 
  )

) 

Here is the function...

add_action( \'wp_ajax_dna_nuke_diary_slots\', \'dna_nuke_diary_slots\' );

function dna_nuke_diary_slots() {

  $user   = $_POST[\'user\']; 
  $stamp  = array($_POST[\'stamp\']);

  // values for these two variables are retrieved from custom data attribute in following html and ajax call

  $stamps = !empty(get_user_meta( $user, \'dna_cal\', true)) ? get_user_meta( $user, \'dna_cal\', true) : array();
  $key    = array_search($stamp, array_column($stamps, \'dna_cal_when\'));

  unset($stamps[$key]);

  $new_stamps   = $stamps;
  $sort_stamps  = array_values($new_stamps);

  update_user_meta( $user, \'dna_cal\', $sort_stamps);

  wp_die();

}

FYI - following is the Ajax call and a sample of the HTML

$(\'.slot\').on(\'click\', \'a.booked\', function(e) {
  e.preventDefault();

  var user   = $(\'#dna_day\').attr( \'data-user\' );
  var stamp  = $(this).attr( \'data-timestamp\' );

  $(this).removeClass(\'booked\').addClass(\'nuked\');

  $.ajax({
    type: \'POST\',
    url: ajax_object.ajaxurl,
    data: {
      action: \'dna_nuke_diary_slots\',
      user: user,
      stamp: stamp
    }
  });

});


<div id="dna_day" class="dna-day" data-user="256">
  <div id="dna_slots" class="slots">
    <div class="slot"><a class="booked" data-timestamp="1576926000" href="#"></a></div>
    <div class="slot"><a class="booked" data-timestamp="1576927800" href="#"></a></div>
    <div class="slot"><a class="booked" data-timestamp="1576929600" href="#"></a></div>
  </div>
</div>