Description:
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I am  backing up a file (the path & filename of which are stored in  $original; the path & filename of the copy are stored in $bkup). I  would also like to copy the file modification time of $original, so,  after copying the file itself, I use:

touch($bkup, filemtime($original));

However, after I use the above "touch" function, filemtime($original) and filemtime($bkup) are often slightly different. For example, I might have:

echo filemtime($original); // gives 1126191599

echo filemtime($bkup); // gives 1126191600

The "touch" function seems to be giving a slightly incorrect file modification time.