可以在switch语句中使用greater then运算符

Question

Below you can see my code. It outputs the 'The number is hundred'. It works perfectly.

$var = 100;

switch($var){
    case (100):
        echo 'The number is hundred';
        break;
    default:
        echo 'default';
        break;
}

//Output:
The number is hundred

I just wanting to know this for the purpose of understanding if it's possible to do something like this:

case (greather then 100):
case (> 100):

And could you also explain why it's not possible or is possible?

Answer 1

It's possible, but it's not considered a good coding practise as switchs should only do equality evaluations.

To do it use this syntax:

switch (TRUE) {
    case ($var == 100): echo 'The number is one hundred';
    case ($var > 100): echo 'The number is greater than one hundred';
    echo 'default';
}

Source