If the result is 0, n_scale is set to 0.

Author: SakiTakamachi

ext/bcmath/libbcmath/src/div.c

@@ -430,6 +430,7 @@ bool bc_divide(bc_num numerator, bc_num divisor, bc_num *quot, size_t scale)
 	_bc_rm_leading_zeros(*quot);
 	if (bc_is_zero(*quot)) {
 		(*quot)->n_sign = PLUS;
+		(*quot)->scale = 0;
 	} else {
 		(*quot)->n_sign = numerator->n_sign == divisor->n_sign ? PLUS : MINUS;
 	}

ext/bcmath/libbcmath/src/divmod.c

@@ -74,6 +74,7 @@ bool bc_divmod(bc_num num1, bc_num num2, bc_num *quot, bc_num *rem, size_t scale
 	(*rem)->n_scale = MIN(scale, (*rem)->n_scale);
 	if (bc_is_zero(*rem)) {
 		(*rem)->n_sign = PLUS;
+		(*rem)->n_scale = 0;
 	}
 
 	return true;

ext/bcmath/libbcmath/src/floor_or_ceil.c

@@ -55,6 +55,7 @@ bc_num bc_floor_or_ceil(bc_num num, bool is_floor)
 check_zero:
 	if (bc_is_zero(result)) {
 		result->n_sign = PLUS;
+		result->n_scale = 0;
 	}
 
 	return result;

ext/bcmath/libbcmath/src/recmul.c

@@ -264,6 +264,7 @@ bc_num bc_multiply(bc_num n1, bc_num n2, size_t scale)
 	_bc_rm_leading_zeros(prod);
 	if (bc_is_zero(prod)) {
 		prod->n_sign = PLUS;
+		prod->n_scale = 0;
 	}
 	return prod;
 }

ext/bcmath/libbcmath/src/round.c

@@ -224,5 +224,6 @@ void bc_round(bc_num num, zend_long precision, zend_long mode, bc_num *result)
 check_zero:
 	if (bc_is_zero(*result)) {
 		(*result)->n_sign = PLUS;
+		(*result)->n_scale = 0;
 	}
 }