PHP用逗号分隔条目，最后一个条目除外？

Question

我正在使用循环从数据库中获取记录。 我想要这样，所以每条记录后都有一个逗号，除非它是最后一条记录，或者只有一条记录要显示。

这是我的部分代码：

while($medals = $db->fetch_array($query))
{
    if($medals['post_count'] != "")
    {
        $requirements = $medals['post_count']." posts";
    }
    if($medals['time_registered'] != "")
    {
        $requirements .= "Registered for ".$medals['time_registered']." days";
    }
    if($medals['thread_count'] != "")
    {
        $requirements .= $medals['thread_count']." threads";
    }           
    if($medals['num_reps'] != "")
    {
        $requirements .= $medals['num_reps']." positive reputations";
    }
}

我该怎么做？

谢谢。

Answer 1

while($medals = $db->fetch_array($query))
{
    $requirements = array();
    if($medals['post_count'] != "")
    {
        $requirements[] = $medals['post_count']." posts";
    }
    if($medals['time_registered'] != "")
    {
        $requirements[] = "Registered for ".$medals['time_registered']." days";
    }
    if($medals['thread_count'] != "")
    {
        $requirements[] = $medals['thread_count']." threads";
    }           
    if($medals['num_reps'] != "")
    {
        $requirements[] = $medals['num_reps']." positive reputations";
    }
    $requirements = implode(', ',$requirements);
}

或者您需要在行之间使用逗号？