is_nan

Function • Params and return types changed in PHP 8.0

Checks whether a float is NAN.

PHP 5
PHP 7
PHP 8.0
Improved
PHP 8.1
PHP 8.2
PHP 8.3
PHP 8.4
PHP 8.5

is_nan Function synopsis

is_nan(float $num): bool

Parameters

$num

Typefloat

The float to check

Return value

Typebool

true if $num is NAN, else false.

Changes to the is_nan Function

PHP 8.0

  • Return type added: bool
  • Parameter name of parameter #1 changed: $val to $num
  • Parameter type added for parameter #1 ($num): float
- is_nan($val)
+ is_nan(float $num): bool

is_nan Function Availability

PHP VersionAvailability
PHP 8.5Future Release Yes
PHP 8.4Upcoming Release Yes
PHP 8.3Supported (Latest) Yes
PHP 8.2Supported Yes
PHP 8.1Security-Fixes Only Yes
PHP 8.0Unsupported Yes
PHP 7.4Unsupported Yes
PHP 7.3Unsupported Yes
PHP 7.2Unsupported Yes
PHP 7.1Unsupported Yes
PHP 7.0Unsupported Yes
PHP 5.6Unsupported Yes
PHP 5.5Unsupported Yes
PHP 5.4Unsupported Yes
PHP 5.3Unsupported Yes