is_numeric Finds whether a variable is a number or a numeric string &reftitle.description; boolis_numeric mixedvar Finds whether the given variable is numeric. &reftitle.parameters; var The variable being evaluated. &reftitle.returnvalues; Returns &true; if var is a number or a numeric string, &false; otherwise. &reftitle.seealso; is_bool is_null is_float is_int is_string is_object is_array