在几秒钟内获得时间

<?php 

    $target = mktime(0, 0, 0, 10, 25, 2010) ;
    $today = time () ;
    $difference =($target-$today) ;
    echo $output = $difference/60 ;

?>

will the above code give time in seconds

No it will give in minutes :) remove the "/60";