php中获取该文件创建时间然后将其转化成距当前时间的天数

filectime(路径) 获取文件创建时间

<?php
$filetime=filectime(文件路径);
$today=date("Y-m-d");
$time=explored("-",$today);
$todaytime=mktime(0,0,0,$time[1],$time[2],$time[0]);
$overTime=rand($todaytime-$filetime)/(3600*24);
echo "相隔$overTime天";
?>

谢谢楼上，我自己写出来的是这样子的
<?php
header("Content-Type:text/html;charset=UTF-8");
error_reporting(E_ALL || ~E_NOTICE);
date_default_timezone_set(PRC);
$str = "./test.txt";
$time = filemtime($str);
$time1 = date("Y-m-d H:i:s",$time);
$a = strtotime($time1);
$b = strtotime("now");
$time2 = $b-$a;
$time3 = $time2/86400;
$time4 = $time3/30;
$time5 = $time4/12;
echo '文章修改时间:';
if($time3<=1){
echo '当天';
}else{
if($time4<=1){
echo floor($time3).天前;
}else{
if($time5<=1){
echo floor($time4).月前;
}else{
echo floor($time5).年前;
};
};
};
exit;
?>
达到了我预期的效果，就是感觉有点恶心。