PHP 시간을 초로 변환하는 예

<?php 
  $time = &#39;21:30:10&#39;; 
  $parsed = date_parse($time); 
  $seconds = $parsed[&#39;hour&#39;] * 3600 + $parsed[&#39;minute&#39;] * 60 + $parsed[&#39;second&#39;]; 
  echo $seconds;
?>

function get_stay_time($timestamp, $is_hour = 1, $is_minutes = 1) 
{ 
    $CI =& get_instance(); 
    if(emptyempty($timestamp) || $timestamp <= 60) { 
        return false; 
    } 
    $time = time(); 
    $remain_time = $time - $timestamp; 
    $day = floor($remain_time / (3600*24)); 
    $day = $day > 0 ? $day.&#39;天&#39; : &#39;&#39;; 
    $hour = floor(($remain_time % (3600*24)) / 3600); 
    $hour = $hour > 0 ? $hour.&#39;小时&#39; : &#39;&#39;; 
    if($is_hour && $is_minutes) { 
        $minutes = floor((($remain_time % (3600*24)) % 3600) / 60); 
        $minutes = $minutes > 0 ? $minutes.&#39;分&#39; : &#39;&#39;; 
        return $day.$hour.$minutes; 
    } 
    if($hour) { 
        return $day.$hour; 
    } 
    return $day; 
}