PHP function is_scalar()

Availability in versions: PHP 4.0.5

Checks if the input is a scalar value.

Scalar variables are variables containing integer (integer), float, string or boolean. The array, object and resource types are not scalar.

Note: The value null is not scalar!

Note:

is_scalar() does not consider values of type resource to be scalar because it is an abstract data type (which may change over time). This implementation detail should not be relied upon as it may change.

Parameters

Parameter	Data type	Default value	Note
$var	mixed	not	Variable to be checked

Return values

bool

Returns true if the input is scalar. Otherwise false.

Other resources

[Official is-scalar documentation](Official documentation)