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).



The value to check

Return Values

Returns true if num is 'not a number', else false.

Related Functions

Example of is_nan

Show all examples for is_nan

PHP Version:

Function is_nan:

Mathematical Functions Functions

Most used PHP functions