How to round down to nearest whole decimal in PHP

Question

Not sure if I've explained the question properly but below are some random examples of what I need to happen

20.39 to become 20.30

40.55 to become 40.50

9.22 to become 9.20

Answer 1

Use floor after multiplying by 10 and then divide by 10 again. To keep the second decimal place after rounding, use number_format.

$values = [20.39,40.55,9.22];
foreach ($values as $value) {
    echo number_format(floor($value * 10) / 10, 2);
}

Output:

20.30
40.50
9.20