About Numbers

PHP has both Intiger and Floting-Point (Decimal) number types. Valid number type variables in PHP can be anithing like.

• 8
• 3014
• 10990647985
• -4.2398503

Notice that these values are never qutoted-in which case they'd be stings with numeric values-nor do they in include commas to indicate thousands.

There are dozens of functions. I'll introduce here are round() and number_format(). The former round a decimal to either nearest intiger.

$n = 3.14;
$n = round ($n); // 3

or to specific number of decimal places

$n = 30142857
$n = round ($n, 3); // 3.143

The number_format() function turns a number into the more commonly written verdion. grouped into thousands using commas. For example:

$n = 20943;
$n = number_format ($n); // 20,943

This function can also a specified number of decimal points.

$n = 20943;
$n = number_format ($n, 2); // 20.943.00