Round to the nearest decimal point in PHP.

<?php
// The common practice of rounding, namely the round() function in PHP, is

// to round to the nearest decimal point, that is, 1.0, 2.0, 3.0, etc. or, 10, 20, 30, etc.
echo round(4.25, 0); // 4
echo round(3.1415926, 2); // 3.14
echo round(299792, - 3); // 300000

// When I'm trying to aggregate all the customer ratings for a specific provider in
// one of my web hosting reviews community, I want to round the average rating to
// the nearest 0.5 (half the decimal) so that a half star would be correctly displayed.

// This is more of a mathematical problem than a PHP one. After some thinking and testing,
// I came up with a slightly more sophisticated solution than but the round() function:

echo round(1.7 * 2) / 2; // 1.5
echo round(2.74 * 2) / 2; // 2.5
echo round(2.75 * 2) / 2; // 3.0

// source: http://www.kavoir.com/2012/10/php-round-to-the-nearest-0-5-1-0-1-5-2-0-2-5-etc.html

?>