(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)
is_finite — Checks whether a float is finite
$num
): bool
Returns whether the given num
is a finite float.
A finite float is neither NAN
(is_nan()),
nor infinite (is_infinite()).
num
The float to check
true
if num
is none of NAN
,
INF
, -INF
, else false
.
Example #1 is_finite() example
<?php$float = 1.2345;var_dump($float, is_finite($float));$nan = sqrt(-1);var_dump($nan, is_finite($nan));$inf = 1e308 * 2;var_dump($inf, is_finite($inf));?>
The above example will output:
float(1.2345) bool(true) float(NAN) bool(false) float(INF) bool(false)