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
)
Checks whether val
is 'not a number',
like the result of acos(1.01).
Parameters
-
val
-
The value to check
Return Values
Returns TRUE if val
is 'not a number',
else FALSE.
