A simple little trick in PHP for when you need to make sure that a value doesn’t drop below zero. For example, you might be subtracting a discount from a basket total and not want the amount to be paid to become negative.
You could do this using a condition like this:-
$total = -8; echo $total > 0 ? $total : 0; // Outputs '0'
However, PHP has an method for doing this for us. We can use the
$value = -9; echo max($value, 0); // Outputs '0'
max does is return the larger number. So if
$value is negative in this example
0 will be the larger number and be returned. If
$value was positive, it would be greater than
0 and therefore
$value would be returned.