(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)
is_infinite — Checks whether a float is infinite
Example #1 is_infinite() example
<?php
$inf = 1e308 * 2;
var_dump($inf, is_infinite($inf));
$negative_inf = -$inf;
var_dump($negative_inf, is_infinite($negative_inf));
?>
The above example will output:
float(INF) bool(true) float(-INF) bool(true)