Detect round number in PHP?

Question

How can I find out whether a float in PHP is a round number?

is_round(1.5); // false
is_round(1.0); // true
is_round(1.00000001); // false

Answer 1

function is_round( $value ) {
    return intval( $value ) == $value;
}

Answer 2

The function specified on this page by thierryreeuwijk should specify your needs.

Answer 3

Modification to Rob's code regarding sterofrog's comment. Code checks to ensure the value is also numeric.

function is_round($value) {
    return is_numeric($value) && intval($value) == $value;
}