PHP in a Nutshell

Name

floor()

Synopsis

    float floor ( float num )

The floor() function takes a floating-point number as its only parameter and rounds it to the nearest integer below its current value. If you provide an integer, nothing will happen. For example:

    $number = floor(11.1); // 11
    $number = floor(11.9); // 11
    $number = floor(11); // 11

Tip

The floor() function converts a positive floating-point number to an integer in the same way as typecasting, except typecasting is faster. This is not true for negative numbers, where the two will produce different results because floor() rounds down (e.g., -3.5 becomes -4) and typecasting knocks off the non-integer data (e.g., -3.5 becomes -3).