(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)
is_finite — Checks whether a float is finite
Returns whether the given num is a finite float.
A finite float is neither NAN (is_nan()),
nor infinite (is_infinite()).
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)