how to reformat a number with commas

Question

I have a line of code that get a count of rows in my table and then display the count. In this case it display the number of downloads.

Right now the count is very s

Answer 1

You can use the number_format() function:

$str = number_format($number);

To use "." instead of ",":

$str = number_format($number, 0, ',', '.');

Answer 2

I believe you are looking for the PHP built-in number_format.

Answer 3

If somebody is looking for the reverse of PHP's number_format function (by the title of this question), here is one:

/**
 * @param string $string
 * @param int $decimals
 * @param string $dec_point
 * @param string $thousands_sep
 *
 * @throws InvalidArgumentException
 * @return float
 */
function number_from_format($string, $decimals = 0, $dec_point = '.', $thousands_sep = ',') {
    $buffer = $string = (string) $string;
    $buffer = strtr($buffer, array($thousands_sep => '', $dec_point => '.'));
    $float = (float) $buffer;
    $test = number_format($float, $decimals, $dec_point, $thousands_sep);
    if ($test !== $string) {
        throw new InvalidArgumentException(sprintf('Unable to parse float from "%s" as number "%s".', $string, $test));
    }
    return $float;
}

Usage Example:

var_dump(number_from_format('1,200.00', 2)); # double(1200)

Answer 4

You can also use FORMAT(X, D) in your query:

Formats the number X to a format like '#,###,###.##', rounded to D decimal places, and returns the result as a string. If D is 0, the result has no decimal point or fractional part.

mysql> SELECT FORMAT(12332.123456, 4);

    -> '12,332.1235'

mysql> SELECT FORMAT(12332.1,4);

    -> '12,332.1000'

mysql> SELECT FORMAT(12332.2,0);

    -> '12,332'

Edit:

I was about to add that "the downside of using this method is that you cannot that number in your code", but apparently this is not a problem anymore, starting from PHP 5.3, thanks to the parse function of NumberFormatter class:

NumberFormatter::parse numfmt_parse

— Parse a number

Example

<?php
$fmt = new NumberFormatter( 'de_DE', NumberFormatter::DECIMAL );
$num = "1.234.567,891";
echo $fmt->parse($num)."\n";
echo $fmt->parse($num, NumberFormatter::TYPE_INT32)."\n";
?>