floor to get lowest integer from a number

Lowest nearest integer of a number by floor()

floor() function returns the highest integer lower than the given number or the nearest integer ( on lower side ) of the number.

<?Php
echo floor(2.7).'<br>'; // Output 2
echo floor(2.4).'<br>'; // Output 2
echo floor(2.5).'<br>'; // Output 2
echo floor(-10.8).'<br>'; // Output -11
echo floor(-10.3).'<br>'; // Output -11
echo floor(-10.5).'<br>'; // Output -11
?>

We get the just lower nearest integer from the number.

Here is a comparison between ceil(), floor() and round() function. For different input numbers we will get different values by using these functions.

Value	Floor()	ceil()	round()
2.7	2	3	3
2.4	2	3	2
2.5	2	3	3
2.48	2	3	2
2.62	2	3	3
2	2	2	2
-8.7	-9	-8	-9
-8.5	-9	-8	-9
-8.3	-9	-8	-8
-8.49	-9	-8	-8
-8.61	-9	-8	-9
-8	-8	-8	-8

Note that there is no point is using ceil() or floor() functions on integers directly. ( we will get the same value )

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