is_scalar Finds whether a variable is a scalar boolis_scalar mixedvar is_scalar returns &true; if the variable given by the var parameter is a scalar, otherwise it returns &false;. Scalar variables are those containing an integer, float, string or boolean. Types array, object and resource are not scalar. // string(10) "hemoglobin" // [1]=> // string(20) "cytochrome c oxidase" // [2]=> // string(10) "ferredoxin" // } ?> ]]> is_scalar does not consider resource type values to be scalar as resources are abstract datatypes which are currently based on integers. This implementation detail should not be relied upon, as it may change. See also is_bool, is_numeric, is_float, is_int, is_real, is_string, is_object, is_array, and is_integer.