diff --git a/library/log4php/layouts/LoggerLayoutPattern.php b/library/log4php/layouts/LoggerLayoutPattern.php
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+++ b/library/log4php/layouts/LoggerLayoutPattern.php
@@ -0,0 +1,171 @@
+<?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
+ */
+
+/**
+ * A flexible layout configurable with a pattern string.
+ *
+ * Configurable parameters:
+ *
+ * * converionPattern - A string which controls the formatting of logging
+ *   events. See docs for full specification.
+ *
+ * @package log4php
+ * @subpackage layouts
+ * @version $Revision: 1395470 $
+ */
+class LoggerLayoutPattern extends LoggerLayout {
+
+    /** Default conversion pattern */
+    const DEFAULT_CONVERSION_PATTERN = '%date %-5level %logger %message%newline';
+
+    /** Default conversion TTCC Pattern */
+    const TTCC_CONVERSION_PATTERN = '%d [%t] %p %c %x - %m%n';
+
+    /** The conversion pattern. */
+    protected $pattern = self::DEFAULT_CONVERSION_PATTERN;
+
+    /** Maps conversion keywords to the relevant converter (default implementation). */
+    protected static $defaultConverterMap = array(
+        'c' => 'LoggerPatternConverterLogger',
+        'lo' => 'LoggerPatternConverterLogger',
+        'logger' => 'LoggerPatternConverterLogger',
+
+        'C' => 'LoggerPatternConverterClass',
+        'class' => 'LoggerPatternConverterClass',
+
+        'cookie' => 'LoggerPatternConverterCookie',
+
+        'd' => 'LoggerPatternConverterDate',
+        'date' => 'LoggerPatternConverterDate',
+
+        'e' => 'LoggerPatternConverterEnvironment',
+        'env' => 'LoggerPatternConverterEnvironment',
+
+        'ex' => 'LoggerPatternConverterThrowable',
+        'exception' => 'LoggerPatternConverterThrowable',
+        'throwable' => 'LoggerPatternConverterThrowable',
+
+        'F' => 'LoggerPatternConverterFile',
+        'file' => 'LoggerPatternConverterFile',
+
+        'l' => 'LoggerPatternConverterLocation',
+        'location' => 'LoggerPatternConverterLocation',
+
+        'L' => 'LoggerPatternConverterLine',
+        'line' => 'LoggerPatternConverterLine',
+
+        'm' => 'LoggerPatternConverterMessage',
+        'msg' => 'LoggerPatternConverterMessage',
+        'message' => 'LoggerPatternConverterMessage',
+
+        'M' => 'LoggerPatternConverterMethod',
+        'method' => 'LoggerPatternConverterMethod',
+
+        'n' => 'LoggerPatternConverterNewLine',
+        'newline' => 'LoggerPatternConverterNewLine',
+
+        'p' => 'LoggerPatternConverterLevel',
+        'le' => 'LoggerPatternConverterLevel',
+        'level' => 'LoggerPatternConverterLevel',
+
+        'r' => 'LoggerPatternConverterRelative',
+        'relative' => 'LoggerPatternConverterRelative',
+
+        'req' => 'LoggerPatternConverterRequest',
+        'request' => 'LoggerPatternConverterRequest',
+
+        's' => 'LoggerPatternConverterServer',
+        'server' => 'LoggerPatternConverterServer',
+
+        'ses' => 'LoggerPatternConverterSession',
+        'session' => 'LoggerPatternConverterSession',
+
+        'sid' => 'LoggerPatternConverterSessionID',
+        'sessionid' => 'LoggerPatternConverterSessionID',
+
+        't' => 'LoggerPatternConverterProcess',
+        'pid' => 'LoggerPatternConverterProcess',
+        'process' => 'LoggerPatternConverterProcess',
+
+        'x' => 'LoggerPatternConverterNDC',
+        'ndc' => 'LoggerPatternConverterNDC',
+
+        'X' => 'LoggerPatternConverterMDC',
+        'mdc' => 'LoggerPatternConverterMDC',
+    );
+
+    /** Maps conversion keywords to the relevant converter. */
+    protected $converterMap = array();
+
+    /**
+     * Head of a chain of Converters.
+     * @var LoggerPatternConverter
+     */
+    private $head;
+
+    /** Returns the default converter map. */
+    public static function getDefaultConverterMap() {
+        return self::$defaultConverterMap;
+    }
+
+    /** Constructor. Initializes the converter map. */
+    public function __construct() {
+        $this->converterMap = self::$defaultConverterMap;
+    }
+
+    /**
+     * Sets the conversionPattern option. This is the string which
+     * controls formatting and consists of a mix of literal content and
+     * conversion specifiers.
+     * @param array $conversionPattern
+     */
+    public function setConversionPattern($conversionPattern) {
+        $this->pattern = $conversionPattern;
+    }
+
+    /**
+     * Processes the conversion pattern and creates a corresponding chain of
+     * pattern converters which will be used to format logging events.
+     */
+    public function activateOptions() {
+        if (!isset($this->pattern)) {
+            throw new LoggerException("Mandatory parameter 'conversionPattern' is not set.");
+        }
+
+        $parser = new LoggerPatternParser($this->pattern, $this->converterMap);
+        $this->head = $parser->parse();
+    }
+
+    /**
+     * Produces a formatted string as specified by the conversion pattern.
+     *
+     * @param LoggerLoggingEvent $event
+     * @return string
+     */
+    public function format(LoggerLoggingEvent $event) {
+        $sbuf = '';
+        $converter = $this->head;
+        while ($converter !== null) {
+            $converter->format($sbuf, $event);
+            $converter = $converter->next;
+        }
+        return $sbuf;
+    }
+}
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