is_finite
PHP function
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(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)
Checks whether a float is finite
Description
is_finite(float $num): bool
Returns whether the given num is a finite float.
A finite float is neither NAN (is_nan()), nor infinite (is_infinite()).
Parameters
numThe Float to check
Return Values
true if num is none of NAN, INF, -INF, else false.
Examples
is_finite() example
php
<?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:
output
float(1.2345)
bool(true)
float(NAN)
bool(false)
float(INF)
bool(false)