Rounding in PHP

For example, I have 0.10456, to become 10.5%? Round
(PHP 3, PHP 4)
Round-rounding floating point numbers
Description
Float round (float val [, int precision])
Returns the result of rounding Val according to the specified precision precision (number of digits after the decimal point). Precision can also be negative or 0 (the default value).
Attention
PHP does not correctly handle strings similar to "12,300.2" by default. See string conversion to numeric value.

Echo round (3.4); 3
Echo round (3.5); 4
Echo round (3.6); 4
Echo Round (3.6, 0); 4
Echo Round (1.95583, 2); 1.96
Echo Round (1241757,-3); 1242000

Note: The precision parameter is available only in PHP 4.

Echo round (0.10456*100,1);

<?php
$num = 0.10456;
Echo Round (($num *100), 1). " %";
?>