将xml转换为PHP数组

这里提供一个类来将XML转换为PHP数组,下面是类的代码

<?php/** * XML2Array: A class to convert XML to array in PHP * It returns the array which can be converted back to XML using the Array2XML script * It takes an XML string or a DOMDocument object as an input. * * See Array2XML: http://www.lalit.org/lab/convert-php-array-to-xml-with-attributes * * Author : Lalit Patel * Website: http://www.lalit.org/lab/convert-xml-to-array-in-php-xml2array * License: Apache License 2.0 *          http://www.apache.org/licenses/LICENSE-2.0 * Version: 0.1 (07 Dec 2011) * Version: 0.2 (04 Mar 2012) *           Fixed typo ‘DomDocument‘ to ‘DOMDocument‘ * * Usage: *       $array = XML2Array::createArray($xml); */

class XML2Array {

    private static $xml = null;    private static $encoding = ‘UTF-8‘;

    /**     * Initialize the root XML node [optional]     * @param $version     * @param $encoding     * @param $format_output     */    public static function init($version = ‘1.0‘, $encoding = ‘UTF-8‘, $format_output = true) {        self::$xml = new DOMDocument($version, $encoding);        self::$xml->formatOutput = $format_output;        self::$encoding = $encoding;    }

    /**     * Convert an XML to Array     * @param string $node_name - name of the root node to be converted     * @param array $arr - aray to be converterd     * @return DOMDocument     */    public static function &createArray($input_xml) {        $xml = self::getXMLRoot();        if(is_string($input_xml)) {            $parsed = $xml->loadXML($input_xml);            if(!$parsed) {                throw new Exception(‘[XML2Array] Error parsing the XML string.‘);            }        } else {            if(get_class($input_xml) != ‘DOMDocument‘) {                throw new Exception(‘[XML2Array] The input XML object should be of type: DOMDocument.‘);            }            $xml = self::$xml = $input_xml;        }        $array[$xml->documentElement->tagName] = self::convert($xml->documentElement);        self::$xml = null;    // clear the xml node in the class for 2nd time use.        return $array;    }

    /**     * Convert an Array to XML     * @param mixed $node - XML as a string or as an object of DOMDocument     * @return mixed     */    private static function &convert($node) {        $output = array();

        switch ($node->nodeType) {            case XML_CDATA_SECTION_NODE:                $output[‘@cdata‘] = trim($node->textContent);                break;

            case XML_TEXT_NODE:                $output = trim($node->textContent);                break;

            case XML_ELEMENT_NODE:

                // for each child node, call the covert function recursively                for ($i=0, $m=$node->childNodes->length; $i<$m; $i++) {                    $child = $node->childNodes->item($i);                    $v = self::convert($child);                    if(isset($child->tagName)) {                        $t = $child->tagName;

                        // assume more nodes of same kind are coming                        if(!isset($output[$t])) {                            $output[$t] = array();                        }                        $output[$t][] = $v;                    } else {                        //check if it is not an empty text node                        if($v !== ‘‘) {                            $output = $v;                        }                    }                }

                if(is_array($output)) {                    // if only one node of its kind, assign it directly instead if array($value);                    foreach ($output as $t => $v) {                        if(is_array($v) && count($v)==1) {                            $output[$t] = $v[0];                        }                    }                    if(empty($output)) {                        //for empty nodes                        $output = ‘‘;                    }                }

                // loop through the attributes and collect them                if($node->attributes->length) {                    $a = array();                    foreach($node->attributes as $attrName => $attrNode) {                        $a[$attrName] = (string) $attrNode->value;                    }                    // if its an leaf node, store the value in @value instead of directly storing it.                    if(!is_array($output)) {                        $output = array(‘@value‘ => $output);                    }                    $output[‘@attributes‘] = $a;                }                break;        }        return $output;    }

    /*     * Get the root XML node, if there isn‘t one, create it.     */    private static function getXMLRoot(){        if(empty(self::$xml)) {            self::init();        }        return self::$xml;    }}?>