ext/intl: Add NumberFormatter::ROUND_HALFODD

The NumberFormatter::ROUND_HALFEVEN constant exists in PHP already, but its counterpart ROUND_HALFODD was missing.
This adds it, using `UNUM_ROUND_HALF_ODD`

Close GH-13191

NEWS

@@ -42,6 +42,7 @@ Intl:
     throws an exception. (David Carlier)
   . Added NumberFormatter::ROUND_TOWARD_ZERO and ::ROUND_AWAY_FROM_ZERO as
     aliases for ::ROUND_DOWN and ::ROUND_UP. (Jorg Sowa)
+  . Added NumberFormatter::ROUND_HALFODD. (Ayesh Karunaratne)
 
 MBString:
   . Added mb_trim, mb_ltrim and mb_rtrim. (Yuya Hamada)

UPGRADING

@@ -281,8 +281,9 @@ PDO_SQLITE:
   . NumberFormatter::ROUND_TOWARD_ZERO and NumberFormatter::ROUND_AWAY_FROM_ZERO
     have been added as aliases for NumberFormatter::ROUND_DOWN and
     NumberFormatter::ROUND_UP to be consistent with the new PHP_ROUND_* modes.
-
     RFC: https://wiki.php.net/rfc/new_rounding_modes_to_round_function
+  . NumberFormatter::ROUND_HALFODD added to complement existing
+    NumberFormatter::ROUND_HALFEVEN functionality.
 
 - MBString:
   . The behavior of mb_strcut is more consistent now on invalid UTF-8 and UTF-16

ext/intl/formatter/formatter.stub.php

@@ -50,6 +50,8 @@ class NumberFormatter
     public const int ROUND_AWAY_FROM_ZERO = UNKNOWN;
     /** @cvalue UNUM_ROUND_HALFEVEN */
     public const int ROUND_HALFEVEN = UNKNOWN;
+    /** @cvalue UNUM_ROUND_HALF_ODD */
+    public const int ROUND_HALFODD = UNKNOWN;
     /** @cvalue UNUM_ROUND_HALFDOWN */
     public const int ROUND_HALFDOWN = UNKNOWN;
     /** @cvalue UNUM_ROUND_HALFUP */

ext/intl/tests/formatter/rounding_modes.phpt

@@ -13,6 +13,7 @@ var_dump(NumberFormatter::ROUND_TOWARD_ZERO);
 var_dump(NumberFormatter::ROUND_UP);
 var_dump(NumberFormatter::ROUND_AWAY_FROM_ZERO);
 var_dump(NumberFormatter::ROUND_HALFEVEN);
+var_dump(NumberFormatter::ROUND_HALFODD);
 var_dump(NumberFormatter::ROUND_HALFDOWN);
 var_dump(NumberFormatter::ROUND_HALFUP);
 
@@ -27,6 +28,7 @@ int(2)
 int(3)
 int(3)
 int(4)
+int(8)
 int(5)
 int(6)
 bool(true)