is_nan

is_nan

(PHP 4 >= 4.2.0, PHP 5)

is_nan -- Finds whether a value is not a number

Description

bool is_nan ( float val )

Returns TRUE if val is 'not a number', like the result of acos(1.01).

See also is_finite() and is_infinite().

© Copyright 2003-2008 www.php-editors.com. The ultimate PHP Editor and PHP IDE site.