PHP Infinity Is Reachable

<?php

var_dump(is_infinite(log(0)));
// true
var_dump(1 > log(0));
// true

Infinite values are sometimes returned by PHP functions, such as log(0) or exp(PHP_INT_MAX). In these cases, beware and do not compare it directly with an integer as a positive is considered bigger than infinite. It is recommended to use the function is_finite.

See Also

• is_infinite() (PHP manual)
• beyond infinity [Try me]

PHP Features

• math
• integer

Last updated: 10 September 2026