floor(): Lowest nearest integer of a number
Round a fraction downward with floor()
floor() returns the next integer value downward. With negative numbers, that means moving toward the more negative integer.
echo floor(4.8); // 4
echo floor(-4.2); // -5
This is the recommended starting pattern. The detailed examples below are retained and modernized for additional variations and explanation.
<?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
?>
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 |
Example: Handling Negative Numbers
$num = -3.7;
echo floor($num); // Output: -4
Example: Rounding Down Prices
$price = 19.99;
echo floor($price); // Output: 19
Example: Comparing floor() and ceil()
$num = 4.3;
echo floor($num); // Output: 4
echo ceil($num); // Output: 5
Math Functions ceil Functions(Next higher integer) base_convert(): Convert number From any base to other
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