XML 생성 Class

<?php
class Xml_Writer {
    var $xml;
    var $indent;
    var $stack = array();
    function XmlWriter($indent = '  ') {
        $this->indent = $indent;
        $this->xml = ''."\n";
    }
    function _indent() {
        for ($i = 0, $j = count($this->stack); $i < $j; $i++) {
            $this->xml .= $this->indent;
        }
    }
    function push($element, $attributes = array()) {
        $this->_indent();
        $this->xml .= '<'.$element;
        foreach ($attributes as $key => $value) {
            $this->xml .= ' '.$key.'="'.htmlentities($value).'"';
        }
        $this->xml .= ">\n";
        $this->stack[] = $element;
    }
    function element($element, $content, $attributes = array()) {
        $this->_indent();
        $this->xml .= '<'.$element;
        foreach ($attributes as $key => $value) {
            $this->xml .= ' '.$key.'="'.htmlentities($value).'"';
        }
        $this->xml .= '>'.htmlentities($content).''."\n";
    }
    function emptyelement($element, $attributes = array()) {
        $this->_indent();
        $this->xml .= '<'.$element;
        foreach ($attributes as $key => $value) {
            $this->xml .= ' '.$key.'="'.htmlentities($value).'"';
        }
        $this->xml .= " />\n";
    }
    function pop() {
        $element = array_pop($this->stack);
        $this->_indent();
        $this->xml .= "\n";
    }
    function getXml() {
        return $this->xml;
    }
}

$xml = new Xml_Writer();
$array = array(
    array('monkey', 'banana', 'Jim'),
    array('hamster', 'apples', 'Kola'),
    array('turtle', 'beans', 'Berty'),
);

$xml->push('zoo');
foreach ($array as $animal) {
    $xml->push('animal', array('species' => $animal[0]));
    $xml->element('name', $animal[2]);
    $xml->element('food', $animal[1]);
    $xml->pop();
}
$xml->pop();

print $xml->getXml();
?>