IS_NAN(3) 1 IS_NAN(3)
is_nan - Finds whether a value is not a number
SYNOPSIS
bool is_nan (float $val)
DESCRIPTION
Checks whether $val is 'not a number', like the result of acos(1.01).
PARAMETERS
o $val
- The value to check
RETURN VALUES
Returns TRUE if $val is 'not a number', else FALSE.
EXAMPLES
Example #1
is_nan(3) example
<?php
// Invalid calculation, will return a
// NaN value
$nan = acos(8);
var_dump($nan, is_nan($nan));
?>
The above example will output:
float(NAN)
bool(true)
SEE ALSO
is_finite(3), is_infinite(3).
PHP Documentation Group IS_NAN(3)
