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<?PHP
/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */

/**
 * XML_Serializer
 *
 * Creates XML documents from PHP data structures like arrays, objects or scalars.
 *
 * PHP versions 4 and 5
 *
 * LICENSE:
 *
 * Copyright (c) 2003-2008 Stephan Schmidt <schst@php.net>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *    * Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *    * Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *    * The name of the author may not be used to endorse or promote products
 *      derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * @category  XML
 * @package   XML_Serializer
 * @author    Stephan Schmidt <schst@php.net>
 * @copyright 2003-2008 Stephan Schmidt <schst@php.net>
 * @license   http://opensource.org/licenses/bsd-license New BSD License
 * @version   CVS: $Id: Serializer.php 294967 2010-02-12 03:10:19Z clockwerx $
 * @link      http://pear.php.net/package/XML_Serializer
 * @see       XML_Unserializer
 */

/**
 * uses PEAR error management
 */
require_once 'PEAR.php';

/**
 * uses XML_Util to create XML tags
 */
require_once 'XML/Util.php';

/**
 * option: string used for indentation
 *
 * Possible values:
 * - any string (default is any string)
 */
define('XML_SERIALIZER_OPTION_INDENT', 'indent');

/**
 * option: string used for linebreaks
 *
 * Possible values:
 * - any string (default is \n)
 */
define('XML_SERIALIZER_OPTION_LINEBREAKS', 'linebreak');

/**
 * option: enable type hints
 *
 * Possible values:
 * - true
 * - false
 */
define('XML_SERIALIZER_OPTION_TYPEHINTS', 'typeHints');

/**
 * option: add an XML declaration
 *
 * Possible values:
 * - true
 * - false
 */
define('XML_SERIALIZER_OPTION_XML_DECL_ENABLED', 'addDecl');

/**
 * option: encoding of the document
 *
 * Possible values:
 * - any valid encoding
 * - null (default)
 */
define('XML_SERIALIZER_OPTION_XML_ENCODING', 'encoding');

/**
 * option: default name for tags
 *
 * Possible values:
 * - any string (XML_Serializer_Tag is default)
 */
define('XML_SERIALIZER_OPTION_DEFAULT_TAG', 'defaultTagName');

/**
 * option: use classname for objects in indexed arrays
 *
 * Possible values:
 * - true
 * - false (default)
 */
define('XML_SERIALIZER_OPTION_CLASSNAME_AS_TAGNAME', 'classAsTagName');

/**
 * option: attribute where original key is stored
 *
 * Possible values:
 * - any string (default is _originalKey)
 */
define('XML_SERIALIZER_OPTION_ATTRIBUTE_KEY', 'keyAttribute');

/**
 * option: attribute for type (only if typeHints => true)
 *
 * Possible values:
 * - any string (default is _type)
 */
define('XML_SERIALIZER_OPTION_ATTRIBUTE_TYPE', 'typeAttribute');

/**
 * option: attribute for class (only if typeHints => true)
 *
 * Possible values:
 * - any string (default is _class)
 */
define('XML_SERIALIZER_OPTION_ATTRIBUTE_CLASS', 'classAttribute');

/**
 * option: scalar values (strings, ints,..) will be serialized as attribute
 *
 * Possible values:
 * - true
 * - false (default)
 * - array which sets this option on a per-tag basis
 */
define('XML_SERIALIZER_OPTION_SCALAR_AS_ATTRIBUTES', 'scalarAsAttributes');

/**
 * option: prepend string for attributes
 *
 * Possible values:
 * - any string (default is any string)
 */
define('XML_SERIALIZER_OPTION_PREPEND_ATTRIBUTES', 'prependAttributes');

/**
 * option: indent the attributes, if set to '_auto',
 * it will indent attributes so they all start at the same column
 *
 * Possible values:
 * - true
 * - false (default)
 * - '_auto'
 */
define('XML_SERIALIZER_OPTION_INDENT_ATTRIBUTES', 'indentAttributes');

/**
 * option: use 'simplexml' to use parent name as tagname
 * if transforming an indexed array
 *
 * Possible values:
 * - XML_SERIALIZER_MODE_DEFAULT (default)
 * - XML_SERIALIZER_MODE_SIMPLEXML
 */
define('XML_SERIALIZER_OPTION_MODE', 'mode');

/**
 * option: add a doctype declaration
 *
 * Possible values:
 * - true
 * - false (default)
 */
define('XML_SERIALIZER_OPTION_DOCTYPE_ENABLED', 'addDoctype');

/**
 * option: supply a string or an array with id and uri
 * ({@see XML_Util::getDoctypeDeclaration()}
 *
 * Possible values:
 * - string
 * - array
 */
define('XML_SERIALIZER_OPTION_DOCTYPE', 'doctype');

/**
 * option: name of the root tag
 *
 * Possible values:
 * - string
 * - null (default)
 */
define('XML_SERIALIZER_OPTION_ROOT_NAME', 'rootName');

/**
 * option: attributes of the root tag
 *
 * Possible values:
 * - array
 */
define('XML_SERIALIZER_OPTION_ROOT_ATTRIBS', 'rootAttributes');

/**
 * option: all values in this key will be treated as attributes
 *
 * Possible values:
 * - string
 */
define('XML_SERIALIZER_OPTION_ATTRIBUTES_KEY', 'attributesArray');

/**
 * option: this value will be used directly as content,
 * instead of creating a new tag, may only be used
 * in conjuction with attributesArray
 *
 * Possible values:
 * - string
 * - null (default)
 */
define('XML_SERIALIZER_OPTION_CONTENT_KEY', 'contentName');

/**
 * option: this value will be used in a comment, instead of creating a new tag
 *
 * Possible values:
 * - string
 * - null (default)
 */
define('XML_SERIALIZER_OPTION_COMMENT_KEY', 'commentName');

/**
 * option: tag names that will be changed
 *
 * Possible values:
 * - array
 */
define('XML_SERIALIZER_OPTION_TAGMAP', 'tagMap');

/**
 * option: function that will be applied before serializing
 *
 * Possible values:
 * - any valid PHP callback
 */
define('XML_SERIALIZER_OPTION_ENCODE_FUNC', 'encodeFunction');

/**
 * option: namespace to use for the document
 *
 * Possible values:
 * - string
 * - null (default)
 */
define('XML_SERIALIZER_OPTION_NAMESPACE', 'namespace');

/**
 * option: type of entities to replace
 *
 * Possible values:
 * - XML_SERIALIZER_ENTITIES_NONE
 * - XML_SERIALIZER_ENTITIES_XML (default)
 * - XML_SERIALIZER_ENTITIES_XML_REQUIRED
 * - XML_SERIALIZER_ENTITIES_HTML
 */
define('XML_SERIALIZER_OPTION_ENTITIES', 'replaceEntities');

/**
 * option: whether to return the result of the serialization from serialize()
 *
 * Possible values:
 * - true
 * - false (default)
 */
define('XML_SERIALIZER_OPTION_RETURN_RESULT', 'returnResult');

/**
 * option: whether to ignore properties that are set to null
 *
 * Possible values:
 * - true
 * - false (default)
 */
define('XML_SERIALIZER_OPTION_IGNORE_NULL', 'ignoreNull');

/**
 * option: whether to use cdata sections for character data
 *
 * Possible values:
 * - true
 * - false (default)
 */
define('XML_SERIALIZER_OPTION_CDATA_SECTIONS', 'cdata');

/**
 * option: whether a boolean FALSE value should become a string
 *
 * Possible values:
 * - true
 * - false (default)
 *
 * @since 0.20.0
 */
define('XML_SERIALIZER_OPTION_FALSE_AS_STRING', 'falseAsString');

/**
 * default mode
 */
define('XML_SERIALIZER_MODE_DEFAULT', 'default');

/**
 * SimpleXML mode
 *
 * When serializing indexed arrays, the key of the parent value is used as a tagname.
 */
define('XML_SERIALIZER_MODE_SIMPLEXML', 'simplexml');

/**
 * error code for no serialization done
 */
define('XML_SERIALIZER_ERROR_NO_SERIALIZATION', 51);

/**
 * do not replace entitites
 */
define('XML_SERIALIZER_ENTITIES_NONE', XML_UTIL_ENTITIES_NONE);

/**
 * replace all XML entitites
 * This setting will replace <, >, ", ' and &
 */
define('XML_SERIALIZER_ENTITIES_XML', XML_UTIL_ENTITIES_XML);

/**
 * replace only required XML entitites
 * This setting will replace <, " and &
 */
define('XML_SERIALIZER_ENTITIES_XML_REQUIRED', XML_UTIL_ENTITIES_XML_REQUIRED);

/**
 * replace HTML entitites
 * @link    http://www.php.net/htmlentities
 */
define('XML_SERIALIZER_ENTITIES_HTML', XML_UTIL_ENTITIES_HTML);

/**
 * Creates XML documents from PHP data structures like arrays, objects or scalars.
 *
 * This class can be used in two modes:
 *
 *  1. Create an XML document from an array or object that is processed by other
 *    applications. That means you can create an RDF document from an array in the
 *    following format:
 *    <code>
 *    $data = array(
 *        'channel' => array(
 *            'title' => 'Example RDF channel',
 *            'link'  => 'http://www.php-tools.de',
 *            'image' => array(
 *                'title' => 'Example image',
 *                'url'   => 'http://www.php-tools.de/image.gif',
 *                'link'  => 'http://www.php-tools.de'
 *            ),
 *            array(
 *                'title' => 'Example item',
 *                'link'  => 'http://example.com'
 *            ),
 *            array(
 *                'title' => 'Another Example item',
 *                'link'  => 'http://example.org'
 *            )
 *        )
 *    );
 *    </code>
 *
 *    To create an RDF document from this array, do the following:
 *
 *    <code>
 *    require_once 'XML/Serializer.php';
 *    $options = array(
 *       XML_SERIALIZER_OPTION_INDENT      => "\t",     // indent with tabs
 *       XML_SERIALIZER_OPTION_LINEBREAKS  => "\n",     // use UNIX line breaks
 *       XML_SERIALIZER_OPTION_ROOT_NAME   => 'rdf:RDF',// root tag
 *       XML_SERIALIZER_OPTION_DEFAULT_TAG => 'item'    // tag for values
 *                                                      // with numeric keys
 *    );
 *    $serializer = new XML_Serializer($options);
 *    $rdf        = $serializer->serialize($data);
 *    </code>
 *
 *    You will get a complete XML document that can be processed like any RDF document.
 *
 * 2. This class can be used to serialize any data structure in a way that it can
 *    later be unserialized again.  XML_Serializer will store the type of the value
 *    and additional meta information in attributes of the surrounding tag. This
 *    meta information can later be used to restore the original data structure
 *    in PHP. If you want XML_Serializer to add meta information to the tags, add
 *    <code>
 *      XML_SERIALIZER_OPTION_TYPEHINTS => true
 *    </code>
 *    to the options array in the constructor.
 *
 * @category  XML
 * @package   XML_Serializer
 * @author    Stephan Schmidt <schst@php.net>
 * @copyright 2003-2008 Stephan Schmidt <schst@php.net>
 * @license   http://opensource.org/licenses/bsd-license New BSD License
 * @version   Release: @package_version@
 * @link      http://pear.php.net/package/XML_Serializer
 * @see       XML_Unserializer
 * @todo      replace extending PEAR class with instead using a PEAR_Error object
 */
class XML_Serializer extends PEAR
{
    /**
     * List of all available options
     *
     * @access private
     * @var    array
     */
    var $_knownOptions = array(
        XML_SERIALIZER_OPTION_INDENT,
        XML_SERIALIZER_OPTION_LINEBREAKS,
        XML_SERIALIZER_OPTION_TYPEHINTS,
        XML_SERIALIZER_OPTION_XML_DECL_ENABLED,
        XML_SERIALIZER_OPTION_XML_ENCODING,
        XML_SERIALIZER_OPTION_DEFAULT_TAG,
        XML_SERIALIZER_OPTION_CLASSNAME_AS_TAGNAME,
        XML_SERIALIZER_OPTION_ATTRIBUTE_KEY,
        XML_SERIALIZER_OPTION_ATTRIBUTE_TYPE,
        XML_SERIALIZER_OPTION_ATTRIBUTE_CLASS,
        XML_SERIALIZER_OPTION_SCALAR_AS_ATTRIBUTES,
        XML_SERIALIZER_OPTION_PREPEND_ATTRIBUTES,
        XML_SERIALIZER_OPTION_INDENT_ATTRIBUTES,
        XML_SERIALIZER_OPTION_MODE,
        XML_SERIALIZER_OPTION_DOCTYPE_ENABLED,
        XML_SERIALIZER_OPTION_DOCTYPE,
        XML_SERIALIZER_OPTION_ROOT_NAME,
        XML_SERIALIZER_OPTION_ROOT_ATTRIBS,
        XML_SERIALIZER_OPTION_ATTRIBUTES_KEY,
        XML_SERIALIZER_OPTION_CONTENT_KEY,
        XML_SERIALIZER_OPTION_COMMENT_KEY,
        XML_SERIALIZER_OPTION_TAGMAP,
        XML_SERIALIZER_OPTION_ENCODE_FUNC,
        XML_SERIALIZER_OPTION_NAMESPACE,
        XML_SERIALIZER_OPTION_ENTITIES,
        XML_SERIALIZER_OPTION_RETURN_RESULT,
        XML_SERIALIZER_OPTION_IGNORE_NULL,
        XML_SERIALIZER_OPTION_CDATA_SECTIONS,
    );

    /**
     * Default options for the serialization
     *
     * @access private
     * @var    array
     */
    var $_defaultOptions = array(

        // string used for indentation
        XML_SERIALIZER_OPTION_INDENT => '',

        // string used for newlines
        XML_SERIALIZER_OPTION_LINEBREAKS => "\n",

        // automatically add type hin attributes
        XML_SERIALIZER_OPTION_TYPEHINTS => false,

        // add an XML declaration
        XML_SERIALIZER_OPTION_XML_DECL_ENABLED => false,

        // encoding specified in the XML declaration
        XML_SERIALIZER_OPTION_XML_ENCODING => null,

        // tag used for indexed arrays or invalid names
        XML_SERIALIZER_OPTION_DEFAULT_TAG => 'XML_Serializer_Tag',

        // use classname for objects in indexed arrays
        XML_SERIALIZER_OPTION_CLASSNAME_AS_TAGNAME => false,

        // attribute where original key is stored
        XML_SERIALIZER_OPTION_ATTRIBUTE_KEY => '_originalKey',

        // attribute for type (only if typeHints => true)
        XML_SERIALIZER_OPTION_ATTRIBUTE_TYPE => '_type',

        // attribute for class of objects (only if typeHints => true)
        XML_SERIALIZER_OPTION_ATTRIBUTE_CLASS => '_class',

        // scalar values (strings, ints,..) will be serialized as attribute
        XML_SERIALIZER_OPTION_SCALAR_AS_ATTRIBUTES => false,

        // prepend string for attributes
        XML_SERIALIZER_OPTION_PREPEND_ATTRIBUTES => '',

        // indent the attributes, if set to '_auto',
        // it will indent attributes so they all start at the same column
        XML_SERIALIZER_OPTION_INDENT_ATTRIBUTES => false,

        // use XML_SERIALIZER_MODE_SIMPLEXML to use parent name as tagname
        // if transforming an indexed array
        XML_SERIALIZER_OPTION_MODE => XML_SERIALIZER_MODE_DEFAULT,

        // add a doctype declaration
        XML_SERIALIZER_OPTION_DOCTYPE_ENABLED => false,

        // supply a string or an array with id and uri
        // ({@see XML_Util::getDoctypeDeclaration()}
        XML_SERIALIZER_OPTION_DOCTYPE => null,

        // name of the root tag
        XML_SERIALIZER_OPTION_ROOT_NAME => null,

        // attributes of the root tag
        XML_SERIALIZER_OPTION_ROOT_ATTRIBS => array(),

        // all values in this key will be treated as attributes
        XML_SERIALIZER_OPTION_ATTRIBUTES_KEY => null,

        // this value will be used directly as content,
        // instead of creating a new tag, may only be used
        // in conjuction with attributesArray
        XML_SERIALIZER_OPTION_CONTENT_KEY => null,

        // this value will be used directly as comment,
        // instead of creating a new tag, may only be used
        // in conjuction with attributesArray
        XML_SERIALIZER_OPTION_COMMENT_KEY => null,

        // tag names that will be changed
        XML_SERIALIZER_OPTION_TAGMAP => array(),

        // function that will be applied before serializing
        XML_SERIALIZER_OPTION_ENCODE_FUNC => null,

        // namespace to use
        XML_SERIALIZER_OPTION_NAMESPACE => null,

        // type of entities to replace,
        XML_SERIALIZER_OPTION_ENTITIES => XML_SERIALIZER_ENTITIES_XML,

        // serialize() returns the result of the serialization instead of true
        XML_SERIALIZER_OPTION_RETURN_RESULT => false,

        // ignore properties that are set to null
        XML_SERIALIZER_OPTION_IGNORE_NULL => false,

        // Whether to use cdata sections for plain character data
        XML_SERIALIZER_OPTION_CDATA_SECTIONS => false,

        // Whether to convert a boolean FALSE into a string
        XML_SERIALIZER_OPTION_FALSE_AS_STRING => false,
    );

    /**
     * Options for the serialization
     *
     * @access public
     * @var    array
     */
    var $options = array();

    /**
     * Current tag depth
     *
     * @access private
     * @var    integer
     */
    var $_tagDepth = 0;

    /**
     * Serialized representation of the data
     *
     * @access private
     * @var    string
     */
    var $_serializedData = null;

    /**
     * Constructor
     *
     * @param mixed $options array containing options for the serialization
     *
     * @access public
     */
    function XML_Serializer( $options = null )
    {
        $this->PEAR();
        if (is_array($options)) {
            $this->options = array_merge($this->_defaultOptions, $options);
        } else {
            $this->options = $this->_defaultOptions;
        }
    }

    /**
     * Return the package version number
     *
     * @access public
     * @static
     * @return string the version number of XML_Serializer
     */
    function apiVersion()
    {
        return '@package_version@';
    }

    /**
     * Reset all options to default options
     *
     * @return void
     * @access public
     */
    function resetOptions()
    {
        $this->options = $this->_defaultOptions;
    }

    /**
     * Set an option
     *
     * You can use this method if you do not want
     * to set all options in the constructor.
     *
     * @param string $name  option name
     * @param mixed  $value option value
     *
     * @return void
     * @access public
     */
    function setOption($name, $value)
    {
        $this->options[$name] = $value;
    }

    /**
     * Sets several options at once
     *
     * You can use this method if you do not want
     * to set all options in the constructor.
     *
     * @param array $options options array
     *
     * @return void
     * @access public
     */
    function setOptions($options)
    {
        $this->options = array_merge($this->options, $options);
    }

    /**
     * serialize data
     *
     * @param mixed $data    data to serialize
     * @param array $options options array
     *
     * @return boolean true on success, pear error on failure
     * @access public
     * @uses XML_Util::getDoctypeDeclaration()
     * @uses XML_Util::getXMLDeclaration()
     * @internal uses error suppression "@settype()"
     */
    function serialize($data, $options = null)
    {
        // if options have been specified, use them instead
        // of the previously defined ones
        if (is_array($options)) {
            $optionsBak = $this->options;
            if (isset($options['overrideOptions'])
                && $options['overrideOptions'] == true
            ) {
                $this->options = array_merge($this->_defaultOptions, $options);
            } else {
                $this->options = array_merge($this->options, $options);
            }
        } else {
            $optionsBak = null;
        }

        //  start depth is zero
        $this->_tagDepth = 0;

        $rootAttributes = $this->options[XML_SERIALIZER_OPTION_ROOT_ATTRIBS];
        if (isset($this->options[XML_SERIALIZER_OPTION_NAMESPACE])
            && is_array($this->options[XML_SERIALIZER_OPTION_NAMESPACE])
        ) {
            $rootAttributes['xmlns:'
                . $this->options[XML_SERIALIZER_OPTION_NAMESPACE][0]] =
                $this->options[XML_SERIALIZER_OPTION_NAMESPACE][1];
        }

        $this->_serializedData = '';
        // serialize an array
        if (is_array($data)) {
            if (isset($this->options[XML_SERIALIZER_OPTION_ROOT_NAME])) {
                $tagName = $this->options[XML_SERIALIZER_OPTION_ROOT_NAME];
            } else {
                $tagName = 'array';
            }

            $this->_serializedData .=
                $this->_serializeArray($data, $tagName, $rootAttributes);
        } elseif (is_object($data)) {
            // serialize an object
            if (isset($this->options[XML_SERIALIZER_OPTION_ROOT_NAME])) {
                $tagName = $this->options[XML_SERIALIZER_OPTION_ROOT_NAME];
            } else {
                $tagName = get_class($data);
            }
            $this->_serializedData .=
                $this->_serializeObject($data, $tagName, $rootAttributes);
        } else {
            $tag = array();
            if (isset($this->options[XML_SERIALIZER_OPTION_ROOT_NAME])) {
                $tag['qname'] = $this->options[XML_SERIALIZER_OPTION_ROOT_NAME];
            } else {
                $tag['qname'] = gettype($data);
            }
            $tagName = $tag['qname'];
            if ($this->options[XML_SERIALIZER_OPTION_TYPEHINTS] === true) {
                $rootAttributes[$this->
                    options[XML_SERIALIZER_OPTION_ATTRIBUTE_TYPE]] = gettype($data);
            }

            if (!is_bool($data)) {
                $tag['content'] = $data;
            } elseif ($data === false) {
                if ($this->options[XML_SERIALIZER_OPTION_FALSE_AS_STRING] === true) {
                    $tag['content'] = '0';
                } else {
                    $tag['content'] = '';
                }
            } else {
                $tag['content'] = $data;
            }

            @settype($data, 'string');
            $tag['attributes']     = $rootAttributes;
            $this->_serializedData = $this->_createXMLTag($tag);
        }

        // add doctype declaration
        if ($this->options[XML_SERIALIZER_OPTION_DOCTYPE_ENABLED] === true) {
            $this->_serializedData =
                XML_Util::getDoctypeDeclaration($tagName,
                $this->options[XML_SERIALIZER_OPTION_DOCTYPE])
                . $this->options[XML_SERIALIZER_OPTION_LINEBREAKS]
                . $this->_serializedData;
        }

        //  build xml declaration
        if ($this->options[XML_SERIALIZER_OPTION_XML_DECL_ENABLED]) {
            $atts                  = array();
            $this->_serializedData = XML_Util::getXMLDeclaration('1.0',
                $this->options[XML_SERIALIZER_OPTION_XML_ENCODING])
                . $this->options[XML_SERIALIZER_OPTION_LINEBREAKS]
                . $this->_serializedData;
        }

        if ($this->options[XML_SERIALIZER_OPTION_RETURN_RESULT] === true) {
            $result = $this->_serializedData;
        } else {
            $result = true;
        }

        if ($optionsBak !== null) {
            $this->options = $optionsBak;
        }

        return $result;
    }

    /**
     * get the result of the serialization
     *
     * @access public
     * @return string serialized XML
     */
    function getSerializedData()
    {
        if ($this->_serializedData == null) {
            return $this->raiseError('No serialized data available. '
                . 'Use XML_Serializer::serialize() first.',
                XML_SERIALIZER_ERROR_NO_SERIALIZATION);
        }
        return $this->_serializedData;
    }

    /**
     * serialize any value
     *
     * This method checks for the type of the value and calls the appropriate method
     *
     * @param mixed  $value      tag value
     * @param string $tagName    tag name
     * @param array  $attributes attributes
     *
     * @return string
     * @access private
     */
    function _serializeValue($value, $tagName = null, $attributes = array())
    {
        if (is_array($value)) {
            $xml = $this->_serializeArray($value, $tagName, $attributes);
        } elseif (is_object($value)) {
            $xml = $this->_serializeObject($value, $tagName);
        } else {
            $tag = array(
                          'qname'      => $tagName,
                          'attributes' => $attributes,
                          'content'    => $value
                        );
            $xml = $this->_createXMLTag($tag);
        }
        return $xml;
    }

    /**
     * serialize an array
     *
     * @param array  &$array     array to serialize
     * @param string $tagName    name of the root tag
     * @param array  $attributes attributes for the root tag
     *
     * @return string $string serialized data
     * @access private
     * @uses XML_Util::isValidName() to check, whether key has to be substituted
     * @uses XML_Util::replaceEntities()
     * @uses XML_Util::createComment()
     * @uses PEAR::popExpect()
     * @uses PEAR::expectError()
     */
    function _serializeArray(&$array, $tagName = null, $attributes = array())
    {
        $_content = null;
        $_comment = null;

        // check for comment
        if ($this->options[XML_SERIALIZER_OPTION_COMMENT_KEY] !== null) {
            if (isset($array[$this->options[XML_SERIALIZER_OPTION_COMMENT_KEY]])
            ) {
                $_comment =
                    $array[$this->options[XML_SERIALIZER_OPTION_COMMENT_KEY]];
                unset($array[$this->options[XML_SERIALIZER_OPTION_COMMENT_KEY]]);
            }
        }

        /**
         * check for special attributes
         */
        if ($this->options[XML_SERIALIZER_OPTION_ATTRIBUTES_KEY] !== null) {
            if (isset($array[$this->options[XML_SERIALIZER_OPTION_ATTRIBUTES_KEY]])
            ) {
                $attributes =
                    $array[$this->options[XML_SERIALIZER_OPTION_ATTRIBUTES_KEY]];
                unset($array[$this->options[XML_SERIALIZER_OPTION_ATTRIBUTES_KEY]]);
            }
            /**
             * check for special content
             */
            if ($this->options[XML_SERIALIZER_OPTION_CONTENT_KEY] !== null) {
                if (isset($array[$this->options[XML_SERIALIZER_OPTION_CONTENT_KEY]])
                ) {
                    $_content =
                        XML_Util::replaceEntities($array
                        [$this->options[XML_SERIALIZER_OPTION_CONTENT_KEY]]);
                    unset($array[$this->options[XML_SERIALIZER_OPTION_CONTENT_KEY]]);
                }
            }
        }

        if ($this->options[XML_SERIALIZER_OPTION_IGNORE_NULL] === true) {
            foreach (array_keys($array) as $key) {
                if (is_null($array[$key])) {
                    unset($array[$key]);
                }
            }
        }

        /*
        * if mode is set to simpleXML, check whether
        * the array is associative or indexed
        */
        if (is_array($array) && !empty($array)
            && $this->options[XML_SERIALIZER_OPTION_MODE]
            == XML_SERIALIZER_MODE_SIMPLEXML
        ) {
            $indexed = true;
            foreach ($array as $key => $val) {
                if (!is_int($key)) {
                    $indexed = false;
                    break;
                }
            }

            if ($indexed
                && $this->options[XML_SERIALIZER_OPTION_MODE]
                == XML_SERIALIZER_MODE_SIMPLEXML
            ) {
                $string = '';
                foreach ($array as $key => $val) {
                    $string .= $this->_serializeValue($val, $tagName, $attributes);

                    $string .= $this->options[XML_SERIALIZER_OPTION_LINEBREAKS];
                    // do indentation
                    if ($this->options[XML_SERIALIZER_OPTION_INDENT]!==null
                        && $this->_tagDepth>0
                    ) {
                        $string .=
                            str_repeat($this->options[XML_SERIALIZER_OPTION_INDENT],
                            $this->_tagDepth);
                    }
                }
                return rtrim($string);
            }
        }

        $scalarAsAttributes = false;
        if (is_array($this->options[XML_SERIALIZER_OPTION_SCALAR_AS_ATTRIBUTES])
            && isset($this->options[XML_SERIALIZER_OPTION_SCALAR_AS_ATTRIBUTES]
            [$tagName])
        ) {
            $scalarAsAttributes =
                $this->options[XML_SERIALIZER_OPTION_SCALAR_AS_ATTRIBUTES][$tagName];
        } elseif ($this->options[XML_SERIALIZER_OPTION_SCALAR_AS_ATTRIBUTES] === true
        ) {
            $scalarAsAttributes = true;
        }

        if ($scalarAsAttributes === true) {
            $this->expectError('*');
            foreach ($array as $key => $value) {
                if (is_scalar($value) && (XML_Util::isValidName($key) === true)) {
                    unset($array[$key]);
                    $attributes[$this->options
                        [XML_SERIALIZER_OPTION_PREPEND_ATTRIBUTES].$key] = $value;
                }
            }
            $this->popExpect();
        } elseif (is_array($scalarAsAttributes)) {
            $this->expectError('*');
            foreach ($scalarAsAttributes as $key) {
                if (!isset($array[$key])) {
                    continue;
                }
                $value = $array[$key];
                if (is_scalar($value) && (XML_Util::isValidName($key) === true)) {
                    unset($array[$key]);
                    $attributes[$this->options
                        [XML_SERIALIZER_OPTION_PREPEND_ATTRIBUTES].$key] = $value;
                }
            }
            $this->popExpect();
        }

        // check for empty array => create empty tag
        if (empty($array)) {
            $tag = array(
                            'qname'      => $tagName,
                            'content'    => $_content,
                            'attributes' => $attributes
                        );
        } else {
            $this->_tagDepth++;
            $tmp = $_content . $this->options[XML_SERIALIZER_OPTION_LINEBREAKS];
            foreach ($array as $key => $value) {
                // do indentation
                if ($this->options[XML_SERIALIZER_OPTION_INDENT]!==null
                    && $this->_tagDepth>0
                ) {
                    $tmp .= str_repeat($this->options[XML_SERIALIZER_OPTION_INDENT],
                        $this->_tagDepth);
                }

                // copy key
                $origKey = $key;
                $this->expectError('*');
                // key cannot be used as tagname => use default tag
                $valid = XML_Util::isValidName($key);
                $this->popExpect();
                if (PEAR::isError($valid)) {
                    if ($this->options[XML_SERIALIZER_OPTION_CLASSNAME_AS_TAGNAME]
                        && is_object($value)
                    ) {
                        $key = get_class($value);
                    } else {
                        $key = $this->_getDefaultTagname($tagName);
                    }
                }

                // once we've established the true $key, is there a tagmap for it?
                if (isset($this->options[XML_SERIALIZER_OPTION_TAGMAP][$key])) {
                    $key = $this->options[XML_SERIALIZER_OPTION_TAGMAP][$key];
                }

                $atts = array();
                if ($this->options[XML_SERIALIZER_OPTION_TYPEHINTS] === true) {
                    $atts[$this->options[XML_SERIALIZER_OPTION_ATTRIBUTE_TYPE]] =
                        gettype($value);
                    if ($key !== $origKey) {
                        $atts[$this->options[XML_SERIALIZER_OPTION_ATTRIBUTE_KEY]] =
                            (string)$origKey;
                    }
                }

                $tmp .= $this->_createXMLTag(array(
                    'qname'      => $key,
                    'attributes' => $atts,
                    'content'    => $value
                ));
                $tmp .= $this->options[XML_SERIALIZER_OPTION_LINEBREAKS];
            }

            $this->_tagDepth--;
            if ($this->options[XML_SERIALIZER_OPTION_INDENT]!==null
                && $this->_tagDepth>0
            ) {
                $tmp .= str_repeat($this->options[XML_SERIALIZER_OPTION_INDENT],
                    $this->_tagDepth);
            }

            if (trim($tmp) === '') {
                $tmp = null;
            }

            $tag = array(
                          'qname'      => $tagName,
                          'content'    => $tmp,
                          'attributes' => $attributes
                        );
        }
        if ($this->options[XML_SERIALIZER_OPTION_TYPEHINTS] === true) {
            if (!isset($tag['attributes']
                [$this->options[XML_SERIALIZER_OPTION_ATTRIBUTE_TYPE]])
            ) {
                $tag['attributes']
                    [$this->options[XML_SERIALIZER_OPTION_ATTRIBUTE_TYPE]] = 'array';
            }
        }

        $string = '';
        if (!is_null($_comment)) {
            $string .= XML_Util::createComment($_comment);
            $string .= $this->options[XML_SERIALIZER_OPTION_LINEBREAKS];
            if ($this->options[XML_SERIALIZER_OPTION_INDENT]!==null
                && $this->_tagDepth>0
            ) {
                $string .= str_repeat($this->options[XML_SERIALIZER_OPTION_INDENT],
                    $this->_tagDepth);
            }
        }
        $string .= $this->_createXMLTag($tag, false);
        return $string;
    }

    /**
     * get the name of the default tag.
     *
     * The name of the parent tag needs to be passed as the
     * default name can depend on the context.
     *
     * @param string $parent name of the parent tag
     *
     * @return string default tag name
     */
    function _getDefaultTagname($parent)
    {
        if (is_string($this->options[XML_SERIALIZER_OPTION_DEFAULT_TAG])) {
            return $this->options[XML_SERIALIZER_OPTION_DEFAULT_TAG];
        }
        if (isset($this->options[XML_SERIALIZER_OPTION_DEFAULT_TAG][$parent])) {
            return $this->options[XML_SERIALIZER_OPTION_DEFAULT_TAG][$parent];
        } elseif (isset($this->options[XML_SERIALIZER_OPTION_DEFAULT_TAG]
            ['#default'])
        ) {
            return $this->options[XML_SERIALIZER_OPTION_DEFAULT_TAG]['#default'];
        } elseif (isset($this->options[XML_SERIALIZER_OPTION_DEFAULT_TAG]
            ['__default'])
        ) {
            // keep this for BC
            return $this->options[XML_SERIALIZER_OPTION_DEFAULT_TAG]['__default'];
        }
        return 'XML_Serializer_Tag';
    }

    /**
     * serialize an object
     *
     * @param object &$object    object to serialize
     * @param string $tagName    tag name
     * @param array  $attributes attributes
     *
     * @return string $string serialized data
     * @access private
     */
    function _serializeObject(&$object, $tagName = null, $attributes = array())
    {
        // check for magic function
        if (method_exists($object, '__sleep')) {
            $propNames = $object->__sleep();
            if (is_array($propNames)) {
                $properties = array();
                foreach ($propNames as $propName) {
                    $properties[$propName] = $object->$propName;
                }
            } else {
                $properties = get_object_vars($object);
            }
        } else {
            $properties = get_object_vars($object);
        }

        if (empty($tagName)) {
            $tagName = get_class($object);
        }

        // typehints activated?
        if ($this->options[XML_SERIALIZER_OPTION_TYPEHINTS] === true) {
            $attributes[$this->options[XML_SERIALIZER_OPTION_ATTRIBUTE_TYPE]]  =
                'object';
            $attributes[$this->options[XML_SERIALIZER_OPTION_ATTRIBUTE_CLASS]] =
                get_class($object);
        }
        $string = $this->_serializeArray($properties, $tagName, $attributes);
        return $string;
    }

    /**
     * create a tag from an array
     * this method awaits an array in the following format
     * array(
     *       'qname'        => $tagName,
     *       'attributes'   => array(),
     *       'content'      => $content,      // optional
     *       'namespace'    => $namespace     // optional
     *       'namespaceUri' => $namespaceUri  // optional
     *   )
     *
     * @param array   $tag       tag definition
     * @param boolean $firstCall whether or not this is the first call
     *
     * @return string $string XML tag
     * @access private
     */
    function _createXMLTag($tag, $firstCall = true)
    {
        // build fully qualified tag name
        if ($this->options[XML_SERIALIZER_OPTION_NAMESPACE] !== null) {
            if (is_array($this->options[XML_SERIALIZER_OPTION_NAMESPACE])) {
                $tag['qname'] = $this->options[XML_SERIALIZER_OPTION_NAMESPACE][0]
                    . ':' . $tag['qname'];
            } else {
                $tag['qname'] = $this->options[XML_SERIALIZER_OPTION_NAMESPACE]
                    . ':' . $tag['qname'];
            }
        }

        // attribute indentation
        if ($this->options[XML_SERIALIZER_OPTION_INDENT_ATTRIBUTES] !== false) {
            $multiline = true;
            $indent    = str_repeat($this->options[XML_SERIALIZER_OPTION_INDENT],
                $this->_tagDepth);

            if ($this->options[XML_SERIALIZER_OPTION_INDENT_ATTRIBUTES] == '_auto') {
                $indent .= str_repeat(' ', (strlen($tag['qname'])+2));

            } else {
                $indent .= $this->options[XML_SERIALIZER_OPTION_INDENT_ATTRIBUTES];
            }
        } else {
            $multiline = false;
            $indent    = false;
        }

        if (is_array($tag['content'])) {
            if (empty($tag['content'])) {
                $tag['content'] =   '';
            }
} elseif (XML_SERIALIZER_OPTION_FALSE_AS_STRING && $tag['content'] === false) {
$tag['content'] = '0';
        } elseif (is_scalar($tag['content']) && (string)$tag['content'] == '') {
            $tag['content'] =   '';
        }

        // replace XML entities
        if ($firstCall === true) {
            if ($this->options[XML_SERIALIZER_OPTION_CDATA_SECTIONS] === true) {
                $replaceEntities = XML_UTIL_CDATA_SECTION;
            } else {
                $replaceEntities = $this->options[XML_SERIALIZER_OPTION_ENTITIES];
            }
        } else {
            // this is a nested call, so value is already encoded
            // and must not be encoded again
            $replaceEntities = XML_SERIALIZER_ENTITIES_NONE;
            // but attributes need to be encoded anyways
            // (done here because the rest of the code assumes the same encoding
            // can be used both for attributes and content)
            foreach ($tag['attributes'] as $k => $v) {
                $v = XML_Util::replaceEntities($v,
                    $this->options[XML_SERIALIZER_OPTION_ENTITIES]);

                $tag['attributes'][$k] = $v;
            }
        }
        if (is_scalar($tag['content']) || is_null($tag['content'])) {
            if ($this->options[XML_SERIALIZER_OPTION_ENCODE_FUNC]) {
                if ($firstCall === true) {
                    $tag['content'] = call_user_func($this->
                        options[XML_SERIALIZER_OPTION_ENCODE_FUNC], $tag['content']);
                }
                $tag['attributes'] = array_map($this->
                    options[XML_SERIALIZER_OPTION_ENCODE_FUNC], $tag['attributes']);
            }
            $tag = XML_Util::createTagFromArray($tag, $replaceEntities, $multiline,
                $indent, $this->options[XML_SERIALIZER_OPTION_LINEBREAKS]);
        } elseif (is_array($tag['content'])) {
            $tag = $this->_serializeArray($tag['content'], $tag['qname'],
                $tag['attributes']);
        } elseif (is_object($tag['content'])) {
            $tag = $this->_serializeObject($tag['content'], $tag['qname'],
                $tag['attributes']);
        } elseif (is_resource($tag['content'])) {
            settype($tag['content'], 'string');
            if ($this->options[XML_SERIALIZER_OPTION_ENCODE_FUNC]) {
                if ($replaceEntities === true) {
                    $tag['content'] = call_user_func($this->
                        options[XML_SERIALIZER_OPTION_ENCODE_FUNC], $tag['content']);
                }
                $tag['attributes'] = array_map($this->
                    options[XML_SERIALIZER_OPTION_ENCODE_FUNC],
                    $tag['attributes']);
            }
            $tag = XML_Util::createTagFromArray($tag, $replaceEntities);
        }
        return  $tag;
    }
}
?>
Creat By MiNi SheLL
Email: devilkiller@gmail.com