Using PHP floor() Function: Syntax, Examples, and Tips

The PHP floor() function rounds a floating‑point number down to the nearest integer, returning the greatest integer less than or equal to the given value; if the argument is already an integer, it is returned unchanged.

Syntax: floor($number) , where $number is the float or integer to be rounded down.

Examples:

• Rounding a float: $number = 3.14; $result = floor($number); echo $result; // 3

• Rounding an integer: $number = 5; $result = floor($number); echo $result; // 5

• Rounding a negative number: $number = -2.5; $result = floor($number); echo $result; // -3

• Using floor() with array_map to process an array: $numbers = [2.3, 4.7, 6.1]; $result = array_map('floor', $numbers); print_r($result); // Array ( [0] => 2 [1] => 4 [2] => 6 )

Notes: floor() only truncates toward negative infinity and does not perform conventional rounding; for rounding use round() . It can be combined with other math functions such as ceil() and fmod() .

In summary, the floor() function is a useful tool for numerical calculations and data processing in PHP.