... Prev . ... Next . Doubles are PHP's floats and are as easy to assign as longs, because their value is also contained directly in the union. The member in the zval.value container is dval ; the corresponding type is IS_DOUBLE . zval *new_double; MAKE_STD_ZVAL(new_double); new_double->type = IS_DOUBLE; new_double->value.dval = 3.45; Alternatively, you can use the macro ZVAL_DOUBLE : . zval *new_double; MAKE_STD_ZVAL(new_double); ZVAL_DOUBLE(new_double, 3.45); . ... Longs (Integers) . ...