round a number to the nearest thousandth in php

To round a number to the nearest thousandth in PHP, you can use the round() function. This function accepts two arguments: the number to be rounded and the number of decimal places to round to.

To round to the nearest thousandth, you can use a second argument of 3, like so:

main.php
$number = 12.34567;
$rounded_number = round($number, 3);
echo $rounded_number; // outputs 12.346
97 chars
4 lines

In this example, $number is the number you want to round, and $rounded_number is the result of rounding $number to the nearest thousandth. The output of this code is 12.346.

Note that round() rounds to the nearest value, so if the number you want to round is exactly halfway between two values, it will round to the nearest even value. For example:

main.php
$number = 12.345;
$rounded_number = round($number, 3);
echo $rounded_number; // outputs 12.345
95 chars
4 lines

Here, the output is 12.345, not 12.346, because 12.345 is exactly halfway between 12.344 and 12.346, and round() rounds to the nearest even value.