is_null Finds whether a variable is &null; &reftitle.description; boolis_null mixedvar Finds whether the given variable is &null;. &reftitle.parameters; var The variable being evaluated. &reftitle.returnvalues; Returns &true; if var is null, &false; otherwise. &reftitle.examples; <function>is_null</function> example ]]> &reftitle.seealso; The &null; type isset is_bool is_numeric is_float is_int is_string is_object is_array