Finds whether a value is not a number
Syntax
is_nan ( float $val ) : bool
Parameters
val
The value to check
Return
Returns TRUE if val is 'not a number', else FALSE.
Examples
<? $val = sqrt(-1); $return = is_nan($val); echo $return; ?>
1
Finds whether a value is not a number
is_nan ( float $val ) : bool
val
The value to check
Returns TRUE if val is 'not a number', else FALSE.
<? $val = sqrt(-1); $return = is_nan($val); echo $return; ?>
1
