Fix behaviour for division by zero

Author: jorgsowa

Zend/zend_compile.c

@@ -8730,7 +8730,7 @@ ZEND_API bool zend_binary_op_produces_error(uint32_t opcode, const zval *op1, co
 		/* Division by zero throws an error. */
 		return 1;
 	}
-	if ((opcode == ZEND_POW) && zval_get_long(op1) == 0 && zval_get_long(op2) <= 0) {
+	if ((opcode == ZEND_POW) && zval_get_long(op1) == 0 && zval_get_long(op2) < 0) {
 		/* 0 ** (<=0) throws a division by zero error. */
 		zend_error(E_DEPRECATED, "Power of base 0 and negative exponent is deprecated");
 	}

Zend/zend_operators.c

@@ -1294,7 +1294,7 @@ static void ZEND_COLD zend_power_base_0_exponent_lt_eq_0_error(void)
 
 static zend_result safe_pow(double *result, double base, double exponent)
 {
-	if (base == 0.0 && exponent <= 0.0) {
+	if (base == 0.0 && exponent < 0.0) {
 		zend_power_base_0_exponent_lt_eq_0_error();
 	}
 

ext/standard/tests/math/pow.phpt

@@ -190,8 +190,6 @@ bool(true)
 
 Deprecated: Power of base 0 and negative exponent is deprecated in %s on line %d
 bool(true)
-
-Deprecated: Power of base 0 and negative exponent is deprecated in %s on line %d
 bool(true)
 bool(true)
 bool(true)
@@ -228,8 +226,6 @@ bool(true)
 
 Deprecated: Power of base 0 and negative exponent is deprecated in %s on line %d
 bool(true)
-
-Deprecated: Power of base 0 and negative exponent is deprecated in %s on line %d
 bool(true)
 bool(true)
 bool(true)
@@ -259,8 +255,6 @@ bool(true)
 
 Deprecated: Power of base 0 and negative exponent is deprecated in %s on line %d
 bool(true)
-
-Deprecated: Power of base 0 and negative exponent is deprecated in %s on line %d
 bool(true)
 bool(true)
 bool(true)

ext/standard/tests/math/pow_divisionbyzero.phpt

@@ -5,15 +5,27 @@ pow() division by zero error
 
 var_dump(pow(0, -0));
 var_dump(pow(0.0, -0));
+var_dump(pow(0, -0.0));
+var_dump(pow(0.0, -0.0));
 var_dump(pow(0, -0.01));
 var_dump(pow(0.0, -0.01));
 var_dump(pow(0, -1));
 var_dump(pow(0.0, -1));
+var_dump(pow(0, -1.1));
+var_dump(pow(0.0, -1.1));
 
 ?>
 --EXPECTF--
 int(1)
-int(1)
+float(1)
+float(1)
+float(1)
+
+Deprecated: Power of base 0 and negative exponent is deprecated in %s on line %d
+float(INF)
+
+Deprecated: Power of base 0 and negative exponent is deprecated in %s on line %d
+float(INF)
 
 Deprecated: Power of base 0 and negative exponent is deprecated in %s on line %d
 float(INF)