A number is a mathematical object and one of the datatypes which is used to count, measure and calculation.
In computer programming, a number is very important datatype. PHP has two types of numbers, Integers & Floating
point numbers. PHP allows us to perform different operations on numbers for example comparing numbers,
operation on series etc.

To round off floating point number

It is possible to round off floating point number through round() function.

Example

<?php
$x = round(13.30);
echo $x;
?>

This will produce following result

13

To compare two approximately equal floating point numbers

It is possible to compare two approximately equal floating point numbers through abs() function.

Example

<?php
$x = 25.0000001;
$y = 25.0000000;
if(abs($x-$y)<0.00001){
echo "$x and $y are approximately equal.";
?>

This will produce following result

25.0000001 and 25.0000000 are approximately equal.

To apply a single code to a range of integers

It is possible to apply a single code to a range of integers using loops.

Example

<?php
$x = 2;
$y = 8;
echo "List of even numbers between 2 and 8 is:"
for ($z = $x; $z <= $y; $z++){
echo $z/n;
?>

This will produce following result

List of even numbers between 2 and 8 is:
2
4
6
8

To search for the number having minimum value in an array of unordered numbers

It is possible to search for the number having minimum value in an array of unordered numbers using sort() function.

Example

<?php
$x = array(100,1,50,25,10);
$y = sort($x);
echo "Minimum value in the array is $y[0].";
?>

This will produce following result

Minimum value in the array is 1.

To search for the number having maximum value in an array of unordered numbers

It is possible to search for the number having maximum value in an array of unordered numbers using sort() function.

Example

<?php
$x = array(100,1,50,25,10);
$y = sort($x);
echo "Maximum value in the array is $y[sizeof($y)-1].";
?>