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