Switch.case speech calling time parameter program error solving

Switch...case Statement call time parameter program error to resolve.
Switch.....case statement with its high interest rate and high convenience has become my most commonly used choice statement, Stristr function Everyone knows it, the combination of these two with the current time to do parameter write statement is a good idea, debugging encountered problems, to solve:
Date_default_timezone_set ("Asia/shanghai");
$h =date ("h:i");
echo $h;//output current time;
Switch ($h) {

Case "12:00";//can take any time, here do tune trial, casually take;
if ($k = "12:00");
if (Stristr ($k, $h)! = "");
echo "Success";
Break
Case "12:01";
if ($k = "12:01");
if (Stristr ($k, $h)! = "");
Echo "has succeeded again";
Break
Default
echo "Failure";
}

?>
Debugging error, please answer, thank you

------Solution--------------------
You $h =date ("h:i");
One more space ahead of time
So does not enter the form as case "12:01"; Any branch, because there are no leading spaces

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