. PHP Manual . Prev . Chapter 33. Creating Variables . Next . Booleans are created just like longs, but have the type IS_BOOL . Allowed values in lval are 0 and 1 : . zval *new_bool; MAKE_STD_ZVAL(new_bool); new_bool->type = IS_BOOL; new_bool->value.lval = 1; The corresponding macros for this type are ZVAL_BOOL (allowing specification of the value) as well as ZVAL_TRUE and ZVAL_FALSE (which explicitly set the value to TRUE and FALSE , respectively). Prev . Home . Next . Strings . Up . Arrays