php常用自建函数学习(3):格林威治标准时间、格式化(Y-m-d H:i:s)的时间、Linux时间截转换

//返回格林威治标准时间
if(!function_exists('MyDate'))
{
  function MyDate($format='Y-m-d H:i:s', $timest=0)
  {
    global $cfg_timezone;
    $addtime = $cfg_timezone * 3600;
    if(empty($format))
      $format = 'Y-m-d H:i:s';
    return gmdate($format, $timest+$addtime);
  }
}
//返回格式化(Y-m-d H:i:s)的时间
if(!function_exists('GetDateTime'))
{
  function GetDateTime($mktime)
  {
    return MyDate('Y-m-d H:i:s',$mktime);
  }
}
//返回格式化(Y-m-d)的日期
if(!function_exists('GetDateMk'))
{
  function GetDateMk($mktime)
  {
    return MyDate('Y-m-d', $mktime);
  }
}
//从普通时间转换为Linux时间截
if(!function_exists('GetMkTime'))
{
  function GetMkTime($dtime)
  {
    if(!preg_match("/[^0-9]/", $dtime))
    {
      return $dtime;
    }
    $dtime = trim($dtime);
    $dt = array(1970, 1, 1, 0, 0, 0);
    $dtime = preg_replace("/[\r\n\t]|日|秒/", " ", $dtime);
    $dtime = str_replace("年", "-", $dtime);
    $dtime = str_replace("月", "-", $dtime);
    $dtime = str_replace("时", ":", $dtime);
    $dtime = str_replace("分", ":", $dtime);
    $dtime = trim(preg_replace("/[ ]{1,}/", " ", $dtime));
    $ds = explode(" ", $dtime);
    $ymd = explode("-", $ds[0]);
    if(!isset($ymd[1])) $ymd = explode(".", $ds[0]);
    if(isset($ymd[0])) $dt[0] = $ymd[0];
    if(isset($ymd[1])) $dt[1] = $ymd[1];
    if(isset($ymd[2])) $dt[2] = $ymd[2];
    if(strlen($dt[0])==2) $dt[0] = '20'.$dt[0];
    if(isset($ds[1]))
    {
      $hms = explode(":", $ds[1]);
      if(isset($hms[0])) $dt[3] = $hms[0];
      if(isset($hms[1])) $dt[4] = $hms[1];
      if(isset($hms[2])) $dt[5] = $hms[2];
    }
    foreach($dt as $k=>$v)
    {
      $v = preg_replace("/^0{1,}/", '', trim($v));
      if($v == '')
      {
        $dt[$k] = 0;
      }
    }
    $mt = mktime($dt[3], $dt[4], $dt[5], $dt[1], $dt[2], $dt[0]);
    if(!empty($mt)) return $mt;
    else return time();
  }
}