PHP xml与数组之间的转换

<?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'));

 */

functionxml2array($contents,$get_attributes= 1, $priority='tag') {

  if(!$contents)returnarray();

  if(!function_exists('xml_parser_create')) {

    // print "'xml_parser_create()' function not found!";

    returnarray();

  }

  // 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($xml_valuesas$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($attributesas$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])andis_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

classarray2xml {

  public$output= "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n";

  public$sub_item= array();

  publicfunction__construct($array) {

    $sub_item=array();

    $this->output .= $this->xmlmake($array);

  }

  publicfunctionxmlmake($array,$fk='') {

    $xml='';

    global$sub_item;

    foreach($arrayas$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;

  }

  publicfunctionoutput(){

    foreach($this->sub_itemas$t){

      $this->output = str_replace("<{$t}><{$t}>","<{$t}>",$this->output);

      $this->output = str_replace("</{$t}></{$t}>","</{$t}>",$this->output);

    }

    return$this->output;

  }

}