php代码
<?php
/**
* array2xml: a class to convert array in php to xml
* it also takes into account attributes names unlike simplexml in php
* it returns the xml in form of domdocument class for further manipulation.
* it throws exception if the tag name or attribute name has illegal chars.
*
* author : lalit patel
* website: http://www.lalit.org/lab/convert-php-array-to-xml-with-attributes
* license: apache license 2.0
* http://www.apache.org/licenses/license-2.0
* version: 0.1 (10 july 2011)
* version: 0.2 (16 august 2011)
* - replaced htmlentities() with htmlspecialchars() (thanks to liel dulev)
* - fixed a edge case where root node has a false/null/0 value. (thanks to liel dulev)
* version: 0.3 (22 august 2011)
* - fixed tag sanitize regex which didn't allow tagnames with single character.
* version: 0.4 (18 september 2011)
* - added support for cdata section using @cdata instead of @value.
* version: 0.5 (07 december 2011)
* - changed logic to check numeric array indices not starting from 0.
* version: 0.6 (04 march 2012)
* - code now doesn't @cdata to be placed in an empty array
* version: 0.7 (24 march 2012)
* - reverted to version 0.5
* version: 0.8 (02 may 2012)
* - removed htmlspecialchars() before adding to text node or attributes.
*
* usage:
* $xml = array2xml::createxml('root_node_name', $php_array);
* echo $xml->savexml();
*/
class array2xml {
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 array to xml
* @param string $node_name - name of the root node to be converted
* @param array $arr - aray to be converterd
* @return domdocument
*/
public static function &createxml($node_name, $arr=array()) {
$xml = self::getxmlroot();
$xml->appendchild(self::convert($node_name, $arr));
self::$xml = null; // clear the xml node in the class for 2nd time use.
return $xml;
}
/**
* convert an array to xml
* @param string $node_name - name of the root node to be converted
* @param array $arr - aray to be converterd
* @return domnode
*/
private static function &convert($node_name, $arr=array()) {
//print_arr($node_name);
$xml = self::getxmlroot();
$node = $xml->createelement($node_name);
if(is_array($arr)){
// get the attributes first.;
if(isset($arr['@attributes'])) {
foreach($arr['@attributes'] as $key => $value) {
if(!self::isvalidtagname($key)) {
throw new exception('[array2xml] illegal character in attribute name. attribute: '.$key.' in node: '.$node_name);
}
$node->setattribute($key, self::bool2str($value));
}
unset($arr['@attributes']); //remove the key from the array once done.
}
// check if it has a value stored in @value, if yes store the value and return
// else check if its directly stored as string
if(isset($arr['@value'])) {
$node->appendchild($xml->createtextnode(self::bool2str($arr['@value'])));
unset($arr['@value']); //remove the key from the array once done.
//return from recursion, as a note with value cannot have child nodes.
return $node;
} else if(isset($arr['@cdata'])) {
$node->appendchild($xml->createcdatasection(self::bool2str($arr['@cdata'])));
unset($arr['@cdata']); //remove the key from the array once done.
//return from recursion, as a note with cdata cannot have child nodes.
return $node;
}
}
//create subnodes using recursion
if(is_array($arr)){
// recurse to get the node for that key
foreach($arr as $key=>$value){
if(!self::isvalidtagname($key)) {
throw new exception('[array2xml] illegal character in tag name. tag: '.$key.' in node: '.$node_name);
}
if(is_array($value) && is_numeric(key($value))) {
// more than one node of its kind;
// if the new array is numeric index, means it is array of nodes of the same kind
// it should follow the parent key name
foreach($value as $k=>$v){
$node->appendchild(self::convert($key, $v));
}
} else {
// only one node of its kind
$node->appendchild(self::convert($key, $value));
}
unset($arr[$key]); //remove the key from the array once done.
}
}
// after we are done with all the keys in the array (if it is one)
// we check if it has any text value, if yes, append it.
if(!is_array($arr)) {
$node->appendchild($xml->createtextnode(self::bool2str($arr)));
}
return $node;
}
/*
* get the root xml node, if there isn't one, create it.
*/
private static function getxmlroot(){
if(empty(self::$xml)) {
self::init();
}
return self::$xml;
}
/*
* get string representation of boolean value
*/
private static function bool2str($v){
//convert boolean to text value.
$v = $v === true ? 'true' : $v;
$v = $v === false ? 'false' : $v;
return $v;
}
/*
* check if the tag name or attribute name contains illegal characters
* ref: http://www.w3.org/tr/xml/#sec-common-syn
*/
private static function isvalidtagname($tag){
$pattern = '/^[a-z_]+[a-z0-9\:\-\.\_]*[^:]*$/i';
return preg_match($pattern, $tag, $matches) && $matches[0] == $tag;
}
}
?>