How do I format a number to a dollar amount in PHP

How do you convert a number to a string showing dollars and cents?

eg:
123.45    => '$123.45'
123.456   => '$123.46'
123       => '$123.00'
.13       => '$0.13'
.1        => '$0.10'
0         => '$0.00'

Answer

PHP also has money_format().

Here’s an example:

echo money_format('$%i', 3.4); // echos '$3.40'

This function actually has tons of options, go to the documentation I linked to to see them.

Note: money_format is undefined in Windows.

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UPDATE: Via the PHP manual: https://www.php.net/manual/en/function.money-format.php

WARNING: This function [money_format] has been DEPRECATED as of PHP 7.4.0. Relying on this function is highly discouraged.

Instead, look into NumberFormatter::formatCurrency.

    $number = "123.45";
    $formatter = new NumberFormatter('en_US', NumberFormatter::CURRENCY);
    return $formatter->formatCurrency($number, 'USD');