Description:
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When a variable is stored via $_GET method (even when parsing to integer) and used in a switch, fails on case 0.

When you use it like: example.php?num=0 
You will get the result: "The number 0 is higer than 5." (Obiously fail)

But if you use 00 instead of 0: example.php?num=00 
You will get the result: "The number 00 is lower than 2." (Which is true)

It also works with " 0": example.php?num= 0
You will get the result: "The number 00 is lower than 2." (Which is true)

Test script:
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$number = $_GET['num'];
// $number = intval($_GET['num']);
// $number = (int) $_GET['num'];

    switch ($number) {
        case ($number<2): 
            $result = 'lower than 2'; 
            break;
        case ($number<5): 
            $result = 'lower than 5'; 
            break;
        case ($number>=5): 
            $result = 'higer than 5'; 
            break; // Se mete aqui con nota = 10
    }
    echo "The number " . $number . " is " . $result . ".";

Expected result:
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The number 0 is lower than 2.

Actual result:
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The number 0 is higer than 5.