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+++ b/library/log4php/pattern/LoggerPatternConverterSuperglobal.php
@@ -0,0 +1,100 @@
+<?php
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * @package log4php
+ */
+
+/**
+ * Returns a value from a superglobal array corresponding to the
+ * given key.
+ *
+ * Option: the key to look up within the superglobal array
+ *
+ * Also, it is possible that a superglobal variable is not populated by PHP
+ * because of the settings in the variables-order ini directive. In this case
+ * the converter will return an empty value.
+ *
+ * @see http://php.net/manual/en/language.variables.superglobals.php
+ * @see http://www.php.net/manual/en/ini.core.php#ini.variables-order
+ *
+ * @package log4php
+ * @subpackage pattern
+ * @version $Revision: 1326626 $
+ * @since 2.3
+ */
+abstract class LoggerPatternConverterSuperglobal extends LoggerPatternConverter {
+
+    /**
+     * Name of the superglobal variable, to be defined by subclasses.
+     * For example: "_SERVER" or "_ENV".
+     */
+    protected $name;
+
+    protected $value = '';
+
+    public function activateOptions() {
+        // Read the key from options array
+        if (isset($this->option) && $this->option !== '') {
+            $key = $this->option;
+        }
+
+        /*
+         * There is a bug in PHP which doesn't allow superglobals to be
+         * accessed when their name is stored in a variable, e.g.:
+         *
+         * $name = '_SERVER';
+         * $array = $$name;
+         *
+         * This code does not work when run from within a method (only when run
+         * in global scope). But the following code does work:
+         *
+         * $name = '_SERVER';
+         * global $$name;
+         * $array = $$name;
+         *
+         * That's why global is used here.
+         */
+        global ${$this->name};
+
+        // Check the given superglobal exists. It is possible that it is not initialized.
+        if (!isset(${$this->name})) {
+            $class = get_class($this);
+            trigger_error("log4php: $class: Cannot find superglobal variable \${$this->name}.", E_USER_WARNING);
+            return;
+        }
+
+        $source = ${$this->name};
+
+        // When the key is set, display the matching value
+        if (isset($key)) {
+            if (isset($source[$key])) {
+                $this->value = $source[$key];
+            }
+        } // When the key is not set, display all values
+        else {
+            $values = array();
+            foreach ($source as $key => $value) {
+                $values[] = "$key=$value";
+            }
+            $this->value = implode(', ', $values);
+        }
+    }
+
+    public function convert(LoggerLoggingEvent $event) {
+        return $this->value;
+    }
+}