is_nan
PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8
is_nan - Finds whether a value is not a number
is_nan(
float$num ): bool
Checks whether num is 'not a number', like the result of acos(1.01).
Parameters
- num
-
The value to check
Return Values
Returns true if num is 'not a number', else false.