本文实例讲述了PHP实现XML与数据格式进行转换类。分享给大家供大家参考。具体如下：

<?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 = "<?xml version="1.0" encoding="utf-8"?>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;

}

}

希望本文所述对大家的php程序设计有所帮助。