PHP implements XML and data format conversion class examples, xml examples

This article describes the PHP implementation XML and data format conversion class. Share it with everyone for your reference. The details are as follows:
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<&#63;php
/**
 * xml2array() will convert the given XML text to an array in the XML structure. 
 * Link: http://www.bin-co.com/php/scripts/xml2array/ 
 * Arguments : $contents - The XML text 
 * $get_attributes - 1 or 0. If this is 1 the function will get the attributes as well as the tag values - this results in a different array structure in the return value. 
 * $priority - Can be 'tag' or 'attribute'. This will change the way the resulting array sturcture. For 'tag', the tags are given more importance.
 * Return: The parsed XML in an array form. Use print_r() to see the resulting array structure. 
 * Examples: $array = xml2array(file_get_contents('feed.xml')); 
 * $array = xml2array(file_get_contents('feed.xml', 1, 'attribute'));
 */
function xml2array($contents, $get_attributes = 1, $priority = 'tag') {
  if (!$contents) return array();
  if (!function_exists('xml_parser_create')) {
    // print "'xml_parser_create()' function not found!";
    return array();
  } 
  // Get the XML parser of PHP - PHP must have this module for the parser to work
  $parser = xml_parser_create('');
  xml_parser_set_option($parser, XML_OPTION_TARGET_ENCODING, "UTF-8"); // http://minutillo.com/steve/weblog/2004/6/17/php-xml-and-character-encodings-a-tale-of-sadness-rage-and-data-loss 
  xml_parser_set_option($parser, XML_OPTION_CASE_FOLDING, 0);
  xml_parser_set_option($parser, XML_OPTION_SKIP_WHITE, 1);
  xml_parse_into_struct($parser, trim($contents), $xml_values);
  xml_parser_free($parser);
  if (!$xml_values) return; //Hmm... 
  // Initializations
  $xml_array = array();
  $parents = array();
  $opened_tags = array();
  $arr = array();
  $current = &$xml_array; //Refference 
  // Go through the tags.
  $repeated_tag_index = array(); //Multiple tags with same name will be turned into an array 
  foreach($xml_values as $data) {
    unset($attributes, $value); //Remove existing values, or there will be trouble 
    // This command will extract these variables into the foreach scope
    // tag(string), type(string), level(int), attributes(array).
    extract($data); //We could use the array by itself, but this cooler. 
    $result = array();
    $attributes_data = array();
    if (isset($value)) {
      if ($priority == 'tag') $result = $value;
      else $result['value'] = $value; //Put the value in a assoc array if we are in the 'Attribute' mode 
    } 
    // Set the attributes too.
    if (isset($attributes) and $get_attributes) {
      foreach($attributes as $attr => $val) {
        if ($priority == 'tag') $attributes_data[$attr] = $val;
        else $result['attr'][$attr] = $val; //Set all the attributes in a array called 'attr' 
      } 
    } 
    // See tag status and do the needed.
    if ($type == "open") { // The starting of the tag '<tag>'
      $parent[$level-1] = &$current;
      if (!is_array($current) or (!in_array($tag, array_keys($current)))) { // Insert New tag
        $current[$tag] = $result;
        if ($attributes_data) $current[$tag . '_attr'] = $attributes_data;
        $repeated_tag_index[$tag . '_' . $level] = 1;
        $current = &$current[$tag];
      } else { // There was another element with the same tag name
        if (isset($current[$tag][0])) { // If there is a 0th element it is already an array
          $current[$tag][$repeated_tag_index[$tag . '_' . $level]] = $result;
          $repeated_tag_index[$tag . '_' . $level]++;
        } else { // This section will make the value an array if multiple tags with the same name appear together
          $current[$tag] = array($current[$tag], $result); //This will combine the existing item and the new item together to make an array 
          $repeated_tag_index[$tag . '_' . $level] = 2;
          if (isset($current[$tag . '_attr'])) { // The attribute of the last(0th) tag must be moved as well
            $current[$tag]['0_attr'] = $current[$tag . '_attr'];
            unset($current[$tag . '_attr']);
          } 
        } 
        $last_item_index = $repeated_tag_index[$tag . '_' . $level]-1;
        $current = &$current[$tag][$last_item_index];
      } 
    } elseif ($type == "complete") { // Tags that ends in 1 line '<tag />'
      // See if the key is already taken.
      if (!isset($current[$tag])) { // New Key
        $current[$tag] = $result;
        $repeated_tag_index[$tag . '_' . $level] = 1;
        if ($priority == 'tag' and $attributes_data) $current[$tag . '_attr'] = $attributes_data;
      } else { // If taken, put all things inside a list(array)
        if (isset($current[$tag][0]) and is_array($current[$tag])) { // If it is already an array...
          // ...push the new element into that array.
          $current[$tag][$repeated_tag_index[$tag . '_' . $level]] = $result;
          if ($priority == 'tag' and $get_attributes and $attributes_data) {
            $current[$tag][$repeated_tag_index[$tag . '_' . $level] . '_attr'] = $attributes_data;
          } 
          $repeated_tag_index[$tag . '_' . $level]++;
        } else { // If it is not an array...
          $current[$tag] = array($current[$tag], $result); //...Make it an array using using the existing value and the new value 
          $repeated_tag_index[$tag . '_' . $level] = 1;
          if ($priority == 'tag' and $get_attributes) {
            if (isset($current[$tag . '_attr'])) { // The attribute of the last(0th) tag must be moved as well
              $current[$tag]['0_attr'] = $current[$tag . '_attr'];
              unset($current[$tag . '_attr']);
            } 
            if ($attributes_data) {
              $current[$tag][$repeated_tag_index[$tag . '_' . $level] . '_attr'] = $attributes_data;
            } 
          } 
          $repeated_tag_index[$tag . '_' . $level]++; //0 and 1 index is already taken 
        } 
      } 
    } elseif ($type == 'close') { // End of tag '</tag>'
      $current = &$parent[$level-1];
    } 
  } 
  return($xml_array);
} 
// Array to XML
class array2xml {
  public $output = "<&#63;xml version=\"1.0\" encoding=\"utf-8\"&#63;>\n";
  public $sub_item = array();
  public function __construct($array) {
    $sub_item = array();
    $this->output .= $this->xmlmake($array);
  } 
  public function xmlmake($array, $fk = '') {
    $xml = '';
    global $sub_item;
    foreach ($array as $key => $value) {
      if (is_array($value)) {
        if (is_numeric($key)) {
          $this->sub_item=array_merge($this->sub_item,array($fk));
          $xml .= "<{$fk}>" . $this->xmlmake($value, $key) . "</{$fk}>";
        } else {
          $xml .= "<{$key}>" . $this->xmlmake($value, $key) . "</{$key}>";
        } 
      } else {
        $xml .= "<{$key}>{$value}</{$key}>\n";
      } 
    } 
    return $xml;
  } 
  public function output(){
    foreach($this->sub_item as $t){
      $this->output = str_replace("<{$t}><{$t}>","<{$t}>",$this->output);
      $this->output = str_replace("</{$t}></{$t}>","</{$t}>",$this->output);
    }
    return $this->output;
  }
}