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问题:

Notice: Use of undefined constant submit - assumed 'submit' in D:\wamp\www\ECMS\insert\monitors.php on line 66

Notice: Undefined index: submit in D:\wamp\www\ECMS\insert\monitors.php on line 66

解决方法:
1: if($_POST['submit']) 加一个判断条件，改为=>
if(isset($_POST['submit']) && $_POST['submit'])

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问题:
Notice: Use of undefined constant Quantity - assumed 'Quantity'
in C:\wamp\www\insert.php on line 13

解决方法:
The notice your are receiving is because of this line:
if (is_numeric($_POST[Quantity]))

It should be:
if (is_numeric($_POST['Quantity']))