PHP文件创建/修改时间

Question

I have a PHP site that accepts file uploads from users and needs to store the file creation/modification (they should be the same in this case) date/time in the database.

I have tried a few approaches. These all seem to return nothing:

$metadata = stat($localfile);
$timestamp = $metadata[9];
die($timestamp);

$metadata = stat($localfile);
$timestamp = $metadata[10];
die($timestamp);

$metadata = filemtime($localfile);
die($metadata);

$metadata = filectime($localfile);
die($metadata);

So I tried a shell_exec approach based on ls -l. This at least returns something, though it would seem that the time is overwritten when the file is uploaded, rendering the output useless (i.e. it returns the current time).

Is there any sure-fire way on Linux/PHP 5.4 to return the creation/modification date/time as it was before the file was uploaded?

NB $localfile is the path to a file on the local system.

Answer 1

As far as I know there is no way in PHP to find the history of a files past modification times. Linux (without adding any extra tools) keeps three times access/modified/change

ls -ce
ls -le
ls -ue

There is no way of getting a 'history' of modifications to a file unless you find an auditing tool in linux to do so for you. Therefore PHP will not support what you're trying to do.

The database is made for precisely storing a history of modifications to a file, use it.