PHP - 如何将文件修改日期与当前日期进行比较

Question

I want to compare the file modification date with the current date.

I tried the following (which is working for the current Time):

$currentDay = date("d");
$currentMonth = date("m");
$currentYear = date("y");
$currentHour = date("h");
$currentMinute = date("i");

Now i tried to get the file modification year from my file:

$subst1 = file("f1/subst_001.htm");
$mod_date=date("y", filemtime($subst1));
echo $mod_date;

But it's giving me for year "70", which is coming from the Year 1970, what did i do wrong?

And no, i already checked if the file says this creation year...

Answer 1

The filetime() function expects string as file path. Here you are trying to pass an array that is returned from file()

Try like this way,

$filename= "f1/subst_001.htm";
if (file_exists($filename)) {
   $mod_date = date("y", filemtime($filename));
   echo $mod_date;
}

January 1, 1970 is the so called Unix epoch. It's the date where they started counting the Unix time. If you get this date as a return value, it usually means that the conversion of your date to the Unix timestamp returned a (near-) zero result. So the date conversion doesn't succeed. Most likely because it receives a wrong input.

Courtesy : Oldskool