Added polyfill for json_last_error_msg.

Author: vimishor

composer.json

@@ -28,7 +28,8 @@
         "ext-curl": "*"
     },
     "autoload": {
-        "psr-0": { "Bitbucket\\": "lib/" }
+        "psr-0": { "Bitbucket\\": "lib/" },
+        "files": ["polyfill-55.php"]
     },
     "scripts": {
         "test": "vendor/bin/phpunit"

polyfill-55.php

@@ -0,0 +1,34 @@
+<?php
+/**
+ * Copyright 2015 - 2016 Alexandru Guzinschi <alex@gentle.ro>
+ *
+ * This software may be modified and distributed under the terms
+ * of the MIT license. See the LICENSE file for details.
+ */
+
+/**
+ * Provides functions unavailable in PHP releases prior to v5.5
+ */
+if (PHP_VERSION_ID < 50500) {
+    if (!function_exists('json_last_error_msg')) {
+        function json_last_error_msg()
+        {
+            switch (json_last_error()) {
+                case JSON_ERROR_NONE:
+                    return 'No error';
+                case JSON_ERROR_DEPTH:
+                    return 'Maximum stack depth exceeded';
+                case JSON_ERROR_STATE_MISMATCH:
+                    return 'State mismatch (invalid or malformed JSON)';
+                case JSON_ERROR_CTRL_CHAR:
+                    return 'Control character error, possibly incorrectly encoded';
+                case JSON_ERROR_SYNTAX:
+                    return 'Syntax error';
+                case JSON_ERROR_UTF8:
+                    return 'Malformed UTF-8 characters, possibly incorrectly encoded';
+                default:
+                    return 'Unknown error';
+            }
+        }
+    }
+}