Implement #47456: Missing PCRE option 'J'

While it is possible to force the same behavior by setting the internal
option (?J), having a dedicated modifier appears to be useful. After all,
J is even listed on the "Pattern Modifiers" man page[1], but the description
referrs to (?J).

[1] <http://php.net/manual/en/reference.pcre.pattern.modifiers.php>

Author: cmb69

ext/pcre/php_pcre.c

@@ -396,6 +396,7 @@ PHPAPI pcre_cache_entry* pcre_get_compiled_regex_cache(char *regex, int regex_le
 						coptions |= PCRE_UCP;
 #endif
 				break;
+			case 'J':	coptions |= PCRE_DUPNAMES;		break;
 
 			/* Custom preg options */
 			case 'e':	poptions |= PREG_REPLACE_EVAL;	break;

ext/pcre/tests/request47456.phpt

@@ -0,0 +1,101 @@
+--TEST--
+Request #47456 (Missing PCRE option 'J')
+--DESCRIPTION--
+The J modifier is supposed to be identical to the internal option (?J), so we're
+testing both.
+--FILE--
+<?php
+preg_match_all('/(?J)(?<chr>[ac])(?<num>\d)|(?<chr>[b])/', 'a1bc3', $m, PREG_SET_ORDER);
+var_dump($m);
+
+unset($m);
+preg_match_all('/(?<chr>[ac])(?<num>\d)|(?<chr>[b])/J', 'a1bc3', $m, PREG_SET_ORDER);
+var_dump($m);
+?>
+--EXPECT--
+array(3) {
+  [0]=>
+  array(5) {
+    [0]=>
+    string(2) "a1"
+    ["chr"]=>
+    string(1) "a"
+    [1]=>
+    string(1) "a"
+    ["num"]=>
+    string(1) "1"
+    [2]=>
+    string(1) "1"
+  }
+  [1]=>
+  array(6) {
+    [0]=>
+    string(1) "b"
+    ["chr"]=>
+    string(1) "b"
+    [1]=>
+    string(0) ""
+    ["num"]=>
+    string(0) ""
+    [2]=>
+    string(0) ""
+    [3]=>
+    string(1) "b"
+  }
+  [2]=>
+  array(5) {
+    [0]=>
+    string(2) "c3"
+    ["chr"]=>
+    string(1) "c"
+    [1]=>
+    string(1) "c"
+    ["num"]=>
+    string(1) "3"
+    [2]=>
+    string(1) "3"
+  }
+}
+array(3) {
+  [0]=>
+  array(5) {
+    [0]=>
+    string(2) "a1"
+    ["chr"]=>
+    string(1) "a"
+    [1]=>
+    string(1) "a"
+    ["num"]=>
+    string(1) "1"
+    [2]=>
+    string(1) "1"
+  }
+  [1]=>
+  array(6) {
+    [0]=>
+    string(1) "b"
+    ["chr"]=>
+    string(1) "b"
+    [1]=>
+    string(0) ""
+    ["num"]=>
+    string(0) ""
+    [2]=>
+    string(0) ""
+    [3]=>
+    string(1) "b"
+  }
+  [2]=>
+  array(5) {
+    [0]=>
+    string(2) "c3"
+    ["chr"]=>
+    string(1) "c"
+    [1]=>
+    string(1) "c"
+    ["num"]=>
+    string(1) "3"
+    [2]=>
+    string(1) "3"
+  }
+}