php – Implode值的数组及其键

目前我这样做：

$values = array(
  'id'                    =>  $sel['id'],'creator_id'            =>  $sel['creator_id'],'campaign_id'           =>  $sel['campaign_id'],'save_results'          =>  $sel['save_results'],'send_results_url'      =>  $sel['send_results_url'],'reply_txt'             =>  $sel['reply_txt'],'allow_multiple_votes'  =>  $sel['allow_multiple_votes']
    );
    $cols = '';
    $vals = '';
    $first = true;
    foreach($values as $col => $val) {
        if(!$first) {
            $cols .= ',';
            $vals .= ',';
        }
        $cols .= $col;
        $vals .= $val;
        $first = false;
    }

困扰我的部分是这样的：

foreach($values as $col => $val) {
  if(!$first) {
    $cols .= ',';
    $vals .= ',';
  }
  $cols .= $col;
  $vals .= $val;
  $first = false;
}

有没有办法内爆数组键？

例如,我能做到

$vals = implode(',',$values);

破坏价值观,但我也需要为密钥做这个.

我也可以用

$keys = array();
    foreach($values as $col => $val)
        $keys[] = $col;
    $cols = implode(',$keys);
    $rows = implode(',$values);

但它仍然需要我循环创建另一个数组,肯定有更好的方法,只需获取密钥？