How can I limit the max value of number?

Question

I want to secure my page by checking if the value is digital (0,1,2,3) and if it is in the range from 0 to 120. I think ctype_digit function limits numbers, so

Answer 1

Here's a simple way:

function set_range($value, $minimum, $maximum) {
    return min(max($minimum, $value), $maximum);
}

Here's what we're doing:

1. compare the number with our minimum value, and take the highest number.
2. compare that result with our maximum value, and take the lowest number.

And here's a test:

// Check every fifth number between 0-60 and 
// set output to within range of 20 to 40.
//
for ($i = 0; $i < 60; $i += 5) {
    echo $i . " becomes " . set_range($i, 20, 40) . PHP_EOL;
}

If you want to check if a number is within a range, you could do this:

function in_range($value, $minimum, $maximum) {
   return ($value >= $minimum) && ($value <= $maximum);
}

echo (in_range( 7, 20, 40)) ? "yes" : "no";  // output: no
echo (in_range(33, 20, 40)) ? "yes" : "no";  // output: yes