php strtotime（）正确的格式

Question

How do I covert this to a proper timestamp?

$Year    = "2011";
$Day     = "7";
$Month   = "3";
$Hour    = "3";
$Minutes = "0";
$Seconds = "0";

/// How do I convert to right timestamp?
$dateToTimestamp =  strtotime("$Month $Day $Year $Hour $Minutes $Seconds");

echo "$dateToTimestamp"; // NOT WORKING. Seconds are updating each refresh. 
// They should be static from the var above. 

Answer 1

Use mktime

$dateToTimestamp = mktime($Hour, $Minutes, $Seconds, $Month, $Day, $Year);