php unix时间戳转换成时间的方法

echo date('Y-m-dTH:i:sZ', 1547740800);
//输出:2019-1-18T00:00:00Z

echo date('c',1547740800);
//输出:2019-1-18T00:00:00Z+02:00

echo date('Y-m-d H:i:s', 1547740800);
//输出:2019-1-18 00:00:00

 $utc='2019-1-18T00:00:00Z';
   $unix= str_replace(array('T','Z'),' ',$utc);
   echo $unix;
  //输出:2019-1-18 00:00:00

$utc='2019-1-18T00:00:00Z';
   $time= str_replace(array('T','Z'),' ',$utc);
   $unix=strtotime($time);
   echo $unix;
  //输出:1547740800

$time='2019-1-18 00:00:00';
   $unix=strtotime($time);
   echo $unix;
   //输出:1547740800

$time='2019-1-18 00:00:00';
   $unix=strtotime($time);
   $utc=date('Y-m-dTH:i:sZ', $unix);
   echo $utc;
   //输出:2019-1-18T00:00:00Z