ここでの回答に基づいて、github リポジトリを作成しましたhttps://github.com/jmarceli/array2xml
インターネット上で最も美しいレポではないかもしれませんが、コードは正常に機能しているようです。
使用できるコードは次のとおりです。
// Based on: http://stackoverflow.com/questions/99350/passing-php-associative-arrays-to-and-from-xml
class ArrayToXML {
private $version;
private $encoding;
/*
* Construct ArrayToXML object with selected version and encoding
*
* for available values check XmlWriter docs http://www.php.net/manual/en/function.xmlwriter-start-document.php
* @param string $xml_version XML Version, default 1.0
* @param string $xml_encoding XML Encoding, default UTF-8
*/
public function __construct($xmlVersion = '1.0', $xmlEncoding = 'UTF-8') {
$this->version = $xmlVersion;
$this->encoding = $xmlEncoding;
}
/**
* Build an XML Data Set
*
* @param array $data Associative Array containing values to be parsed into an XML Data Set(s)
* @param string $startElement Root Opening Tag, default data
* @return string XML String containig values
* @return mixed Boolean false on failure, string XML result on success
*/
public function buildXML($data, $startElement = 'data'){
if(!is_array($data)){
$err = 'Invalid variable type supplied, expected array not found on line '.__LINE__." in Class: ".__CLASS__." Method: ".__METHOD__;
trigger_error($err);
//if($this->_debug) echo $err;
return false; //return false error occurred
}
$xml = new XmlWriter();
$xml->openMemory();
$xml->startDocument($this->version, $this->encoding);
$xml->startElement($startElement);
$this->writeEl($xml, $data);
$xml->endElement();//write end element
//returns the XML results
return $xml->outputMemory(true);
}
/**
* Write keys in $data prefixed with @ as XML attributes, if $data is an array.
* When an @ prefixed key is found, a '%' key is expected to indicate the element itself,
* and '#' prefixed key indicates CDATA content
*
* @param object $xml XMLWriter Object
* @param array $data with attributes filtered out
*/
protected function writeAttr(XMLWriter $xml, $data) {
if(is_array($data)) {
$nonAttributes = array();
foreach($data as $key => $val) {
//handle an attribute with elements
if($key[0] == '@') {
$xml->writeAttribute(substr($key, 1), $val);
} else if($key[0] == '%') {
if(is_array($val)) $nonAttributes = $val;
else $xml->text($val);
} elseif($key[0] == '#') {
if(is_array($val)) $nonAttributes = $val;
else {
$xml->startElement(substr($key, 1));
$xml->writeCData($val);
$xml->endElement();
}
}
//ignore normal elements
else $nonAttributes[$key] = $val;
}
return $nonAttributes;
}
else return $data;
}
/**
* Write XML as per Associative Array
*
* @param object $xml XMLWriter Object
* @param array $data Associative Data Array
*/
protected function writeEl(XMLWriter $xml, $data) {
foreach($data as $key => $value) {
if(is_array($value) && !$this->isAssoc($value)) { //numeric array
foreach($value as $itemValue){
if(is_array($itemValue)) {
$xml->startElement($key);
$itemValue = $this->writeAttr($xml, $itemValue);
$this->writeEl($xml, $itemValue);
$xml->endElement();
} else {
$itemValue = $this->writeAttr($xml, $itemValue);
$xml->writeElement($key, "$itemValue");
}
}
} else if(is_array($value)) { //associative array
$xml->startElement($key);
$value = $this->writeAttr($xml, $value);
$this->writeEl($xml, $value);
$xml->endElement();
} else { //scalar
$value = $this->writeAttr($xml, $value);
$xml->writeElement($key, "$value");
}
}
}
/*
* Check if array is associative with string based keys
* FROM: http://stackoverflow.com/questions/173400/php-arrays-a-good-way-to-check-if-an-array-is-associative-or-sequential/4254008#4254008
*
* @param array $array Array to check
*/
protected function isAssoc($array) {
return (bool)count(array_filter(array_keys($array), 'is_string'));
}
}
その後、ArrayToXMLクラスを使用するだけです。例：
$xml = new ArrayToXML();
print $xml->buildXML($input);