mktime

[poeta1978]

$d = explode(' ',$Assegnazione_Ticket);
$dt = explode('-',$d[0]);
$ora = explode(':',$d[1]);
$y = $dt[0];
$m = $dt[1];
$d = $dt[2];
$h = $ora[0];
$i = $ora[1];
$s = $ora[2];
$timestamp_data = mktime($h,$i,$s,$m,$d,$y);
$timestamp_oggi = time();
$differenza = $timestamp_data - $timestamp_oggi; 

Perché mi da' Warning: mktime() expects parameter 1 to be long, string given in...?