I'm very new at php. I get these errors when I write these codes.
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Professor Abronsius
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SAMEAN
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please add the actual code rather than a screenshot of the code. The problem is that you do not check for the existence of the querystring parameter `islem` before trying to use it in logic operations – Professor Abronsius Sep 15 '18 at 20:49
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You are using the method POST in the form and getting the variables with GET
Either Try method : GET or try $_POST["islem"];

Manuraj Sebastian
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check to see if islem was passed in before trying to access it
if (isset($_POST['islem']) {
// your code here
}
Otherwise you won't be able to load the page up initially in order to submit the form. Also notice that I used _POST here, this is because you used the POST method in your form.

wheelmaker
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