PHP parsing xml format data tool class example explanation

class ome_xml {

  /**

  * xml资源

  *

  * @var    resource

  * @see    xml_parser_create()

  */

  public $parser;

  /**

  * 资源编码

  *

  * @var    string

  */

  public $srcenc;

  /**

  * target encoding

  *

  * @var    string

  */

  public $dstenc;

  /**

  * the original struct

  *

  * @access  private

  * @var    array

  */

  public $_struct = array();

  /**

  * Constructor

  *

  * @access    public

  * @param    mixed    [$srcenc] source encoding

  * @param    mixed    [$dstenc] target encoding

  * @return    void

  * @since

  */

  function SofeeXmlParser($srcenc = null, $dstenc = null) {

    $this->srcenc = $srcenc;

    $this->dstenc = $dstenc;

    // initialize the variable.

    $this->parser = null;

    $this->_struct = array();

  }

  /**

  * Parses the XML file

  *

  * @access    public

  * @param    string    [$file] the XML file name

  * @return    void

  * @since

  */

  function xml2array($file) {

    //$this->SofeeXmlParser('utf-8');

  $data = file_get_contents($file);

    $this->parseString($data);

    return $this->getTree();

  }

  function xml3array($file){

  $data = file_get_contents($file);

  $this->parseString($data);

  return $this->_struct;

  }

  /**

  * Parses a string.

  *

  * @access    public

  * @param    string    data XML data

  * @return    void

  */

  function parseString($data) {

    if ($this->srcenc === null) {

      $this->parser = xml_parser_create();

    } else {

      if($this->parser = xml_parser_create($this->srcenc)) {

        return 'Unable to create XML parser resource with '. $this->srcenc .' encoding.';

      }

    }

    if ($this->dstenc !== null) {

      @xml_parser_set_option($this->parser, XML_OPTION_TARGET_ENCODING, $this->dstenc) or die('Invalid target encoding');

    }

    xml_parser_set_option($this->parser, XML_OPTION_CASE_FOLDING, 0);  // lowercase tags

    xml_parser_set_option($this->parser, XML_OPTION_SKIP_WHITE, 1);    // skip empty tags

    if (!xml_parse_into_struct($this->parser, $data, $this->_struct)) {

      /*printf("XML error: %s at line %d",

          xml_error_string(xml_get_error_code($this->parser)),

          xml_get_current_line_number($this->parser)

      );*/

      $this->free();

      return false;

    }

    $this->_count = count($this->_struct);

    $this->free();

  }

  /**

  * return the data struction

  *

  * @access    public

  * @return    array

  */

  function getTree() {

    $i = 0;

    $tree = array();

    $tree = $this->addNode(

      $tree,

      $this->_struct[$i]['tag'],

      (isset($this->_struct[$i]['value'])) ? $this->_struct[$i]['value'] : '',

      (isset($this->_struct[$i]['attributes'])) ? $this->_struct[$i]['attributes'] : '',

      $this->getChild($i)

    );

    unset($this->_struct);

    return $tree;

  }

  /**

  * recursion the children node data

  *

  * @access    public

  * @param    integer    [$i] the last struct index

  * @return    array

  */

  function getChild(&$i) {

    // contain node data

    $children = array();

    // loop

    while (++$i < $this->_count) {

      // node tag name

      $tagname = $this->_struct[$i]['tag'];

      $value = isset($this->_struct[$i]['value']) ? $this->_struct[$i]['value'] : '';

      $attributes = isset($this->_struct[$i]['attributes']) ? $this->_struct[$i]['attributes'] : '';

      switch ($this->_struct[$i]['type']) {

        case 'open':

          // node has more children

          $child = $this->getChild($i);

          // append the children data to the current node

          $children = $this->addNode($children, $tagname, $value, $attributes, $child);

          break;

        case 'complete':

          // at end of current branch

          $children = $this->addNode($children, $tagname, $value, $attributes);

          break;

        case 'cdata':

          // node has CDATA after one of it's children

          $children['value'] .= $value;

          break;

        case 'close':

          // end of node, return collected data

          return $children;

          break;

      }

    }

    //return $children;

  }

  /**

  * Appends some values to an array

  *

  * @access    public

  * @param    array    [$target]

  * @param    string    [$key]

  * @param    string    [$value]

  * @param    array    [$attributes]

  * @param    array    [$inner] the children

  * @return    void

  * @since

  */

  function addNode($target, $key, $value = '', $attributes = '', $child = '') {

    if (!isset($target[$key]['value']) && !isset($target[$key][0])) {

      if ($child != '') {

        $target[$key] = $child;

      }

      if ($attributes != '') {

        foreach ($attributes as $k => $v) {

          $target[$key][$k] = $v;

        }

      }

      $target[$key]['value'] = $value;

    } else {

      if (!isset($target[$key][0])) {

        // is string or other

        $oldvalue = $target[$key];

        $target[$key] = array();

        $target[$key][0] = $oldvalue;

        $index = 1;

      } else {

        // is array

        $index = count($target[$key]);

      }

      if ($child != '') {

        $target[$key][$index] = $child;

      }

      if ($attributes != '') {

        foreach ($attributes as $k => $v) {

          $target[$key][$index][$k] = $v;

        }

      }

      $target[$key][$index]['value'] = $value;

    }

    return $target;

  }

  /**

  * Free the resources

  *

  * @access    public

  * @return    void

  **/

  function free() {

    if (isset($this->parser) && is_resource($this->parser)) {

      xml_parser_free($this->parser);

      unset($this->parser);

    }

  }

}