How do I format a number with commas like a monetary value?

One of the great things about PHP is that there is a built in function to do most common tasks and save you writing a custom function to do it instead.

One such example of this is with regard number formatting, for instance if you want to turn this:
123456789
into this:
123,456,789

PHP will take care of this with the number_format function:


<?php

$value = 123456789;

echo number_format($value);

?>

Which will print to the screen just what you want: '123,456,789'

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How do I format a number with commas like a monetary value?

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