Round Number in PHP

Maret 27, 2011

Discussion Board : One of the important functions in the mathematical calculations, that do rounding numbers with PHP
Requirements : Webserver package, already installed.

One friend who is building an ecommerce never ask something like this: “How can I create a program that, items weighing less than 1 kg to 1 kg is considered 1 kg, then more than 1 kg to 2 kg is considered 2 kg, and so on? “
The problem above can be written as follows:
1> = weight> 0 —> considered to be 1 kg
2> weight => 1 —> 2 kg is considered
etc. ..

Actually, this problem is not a complex problem. Absolutely not complicated in fact. Examples of the above case is just one example of cases that can be resolved easily by Rounding. In PHP, the known three mathematical functions that can be used for rounding, namely ceil, Floor, and Round.

1. Rounding upwards (ceil).
For example for the above case

<?php
$berat1 = 0.5;
$berat2 = 1.5;
$berat3 = 2;
echo 'berat 1 ='.ceil($berat1); echo '<br />';
echo 'berat 2 ='.ceil($berat2); echo '<br />';
echo 'berat 3 ='.ceil($berat3);
?>

If the script above is executed, then the output is as follows,
berat 1 = 1
berat 2 = 2
berat 3 = 2
So the conclusion is that the PHP function ceil will perform rounding upwards on the given number. This function will produce the nearest integer value of upwards of a number.

2. Rounding down (floor).
Floor used for rounding down. See the example below,

<?php
$berat1 = 0.5;
$berat2 = 1.5;
$berat3 = 2;
echo 'berat 1 ='.floor($berat1); echo '<br />';
echo 'berat 2 ='.floor($berat2); echo '<br />';
echo 'berat 3 ='.floor($berat3);
?>

If the script above is executed, then the output is as follows,
berat 1 = 0
berat 2 = 1
berat 3 = 2
Contrary to ceil, the floor will do the rounding to the nearest integer value down of a number.

3. Rounding to the nearest
ROUND round a number to the nearest value in accordance with the number behind the comma deciman desired. For example,

<?php
$berat1 = 0.58989;
$berat2 = 1.6;
$berat3 = 2.4;
echo 'berat 1 ='.round($berat1, 2); echo '<br />'; // with 2 decimal
echo 'berat 2 ='.round($berat2, 0); echo '<br />'; // 0 decimal
echo 'berat 3 ='.round($berat3); // without parameter, so it will rounded in to the nearest integer
?>

If the script above is executed, then the output is as follows,
berat 1 = 0.59
berat 2 = 2
berat 3 = 2

Hope it hels! Happy coding
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