Add a test and declare the local vars locally

ext/curl/interface.c

@@ -2007,10 +2007,6 @@ string_copy:
 				HashTable        *postfields;
 				struct HttpPost  *first = NULL;
 				struct HttpPost  *last  = NULL;
-				char             *postval;
-				char             *string_key = NULL;
-				ulong             num_key;
-				uint              string_key_len;
 
 				postfields = HASH_OF(*zvalue);
 				if (!postfields) {
@@ -2023,11 +2019,16 @@ string_copy:
 					 zend_hash_get_current_data(postfields, (void **) &current) == SUCCESS;
 					 zend_hash_move_forward(postfields)
 				) {
+					char *postval;
+					char *string_key = NULL;
+					uint  string_key_len;
+					ulong num_key;
 
 					SEPARATE_ZVAL(current);
 					convert_to_string_ex(current);
 
 					zend_hash_get_current_key_ex(postfields, &string_key, &string_key_len, &num_key, 0, NULL);
+
 					/* Pretend we have a string_key here */
 					if(!string_key) {
 						spprintf(&string_key, 0, "%ld", num_key);

ext/curl/tests/bug55767.phpt

@@ -0,0 +1,53 @@
+--TEST--
+Test curl_opt() function with POST params from array with a numeric key
+--SKIPIF--
+<?php 
+if (!extension_loaded("curl")) exit("skip curl extension not loaded");
+if (false === getenv('PHP_CURL_HTTP_REMOTE_SERVER'))  exit("skip PHP_CURL_HTTP_REMOTE_SERVER env variable is not defined");
+?>
+--FILE--
+<?php
+/* Prototype  : bool curl_setopt(resource ch, int option, mixed value)
+ * Description: Set an option for a cURL transfer
+ * Source code: ext/curl/interface.c
+ * Alias to functions:
+ */
+
+  $host = getenv('PHP_CURL_HTTP_REMOTE_SERVER');
+
+  // start testing
+  echo '*** Testing curl sending through GET an POST ***' . "\n";
+
+  $url = "{$host}/get.php?test=getpost&get_param=Hello%20World";
+  $ch = curl_init();
+
+  ob_start(); // start output buffering
+  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
+  curl_setopt($ch, CURLOPT_POST, 1);
+  curl_setopt($ch, CURLOPT_POSTFIELDS, array('Hello'=>'World','Foo'=>'Bar',100=>'John Doe'));
+  curl_setopt($ch, CURLOPT_URL, $url); //set the url we want to use
+  
+  $curl_content = curl_exec($ch);
+  curl_close($ch);
+
+  var_dump( $curl_content );
+?>
+===DONE===
+--EXPECTF--
+*** Testing curl sending through GET an POST ***
+string(203) "array(2) {
+  ["test"]=>
+  string(7) "getpost"
+  ["get_param"]=>
+  string(11) "Hello World"
+}
+array(3) {
+  ["Hello"]=>
+  string(5) "World"
+  ["Foo"]=>
+  string(3) "Bar"
+  [100]=>
+  string(8) "John Doe"
+}
+"
+===DONE===