PHP Manual: floor

function floor(int|float $num): float

Returns the next lowest integer value (as float) by rounding down num if necessary.

num rounded to the next lowest integer. The return value of floor() is still of type float.

Version	Description
8.0.0	`num` no longer accepts internal objects which support numeric conversion.

Example #1 floor() example

<?php
echo floor(4.3), PHP_EOL;   // 4
echo floor(9.999), PHP_EOL; // 9
echo floor(-3.14), PHP_EOL; // -4
?>

floor