Rounding Numbers in PHP

In PHP, the rounding of numbers is done using the round function. See an example of rounding to integers:

<?php
	echo round(3.4); // will output 3
	echo round(3.5); // will output 3
	echo round(3.6); // will output 4
?>

The second parameter of the function can specify the number of digits in the fractional part. Let's round to tenths and hundredths:

<?php
	echo round(3.345, 1); // will output 3.3
	echo round(3.345, 2); // will output 3.35
?>

You can also round a number upwards. For this, the ceil function is used. See the example:

<?php
	echo ceil(3.1); // will output 4
	echo ceil(3.5); // will output 4
	echo ceil(3.6); // will output 4
?>

You can also round a number downwards. For this, the floor function is used. See the example:

<?php
	echo floor(3.9); // will output 3
	echo floor(3.5); // will output 3
	echo floor(3.1); // will output 3
?>