is_numeric

Function • Params and return types changed in PHP 8.0

Finds whether a variable is a number or a numeric string.

PHP 5
PHP 7
PHP 8.0
Improved
PHP 8.1-8.2
PHP 8.3-8.4
PHP 8.5
PHP 8.6

is_numeric Function synopsis

is_numeric(mixed $value): bool

Parameters

$value

Typemixed

The variable being evaluated.

Return value

Typebool

Returns true if $value is a number or a numeric string, false otherwise.

Changes to the is_numeric Function

PHP 8.0

  • Return type added: bool
  • Parameter type added for parameter #1 ($value): mixed
- is_numeric($value)
+ is_numeric(mixed $value): bool

is_numeric Function Availability

PHP VersionAvailability
PHP 8.6Upcoming Release Yes
PHP 8.5Supported (Latest) Yes
PHP 8.4Supported Yes
PHP 8.3Supported Yes
PHP 8.2Security-Fixes Only 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