PHP Manual: Round fractions down

float floor(intfloat $num)

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);   // 4
echo floor(9.999); // 9
echo floor(-3.14); // -4
?>

floor