PHP: How to check if a number has more than two decimals

Question

I\'m trying to pick out numbers with more than two decimals (more than two digits after the decimal separator). I cant\'t figure out why this doesn\'t work:

if (         


        

Answer 1

You can use a regex to figure out if it has more than 2 decimals:

 0);
    }

    $numbers = array(123.456, 123.450, '123.450', 123.45000001, 123, 123.4);

    foreach ($numbers as $number) {
        echo $number . ': ' . (doesNumberHaveMoreThan2Decimals($number) ? 'Y' : 'N') . PHP_EOL;
    }
?>

Output:

123.456:      Y
123.45:       N
123.450:      N
123.45000001: Y
123:          N
123.4:        N

DEMO

Regex autopsy (/\.[0-9]{2,}[1-9][0-9]*$/):

• \. - a literal . character
• [0-9]{2,} - Digits from 0 to 9 matched 2 or more times
• [1-9] - A digit between 1 and 9 matched a single time (to make sure we ignore trailing zeroes)
• [0-9]* - A digit between 0 and 9 matched 0 to infinity times (to make sure that we allow 123.4510 even though it ends with 0).
• $ - The string MUST end here - nothing else can be between our last match and the end of the string