PHP handles conversion between arrays and XML

In development, we often encounter the conversion between arrays and XML, especially when dealing with interface development. For example, if the other client POSTs data in XML format to the server, the program on the server must be responsible To receive analysis, it is also necessary to provide data table data to third-party applications in XML format.
In this article we will briefly introduce how to use PHP to handle conversion between arrays and XML.

PHP converts arrays into XML
PHP can convert arrays into xml format. The simple way is to traverse the array, then convert the key/value of the array into xml nodes, and then echo the output directly, such as:

function arrayToXml($arr){
$xml = "<root>";
foreach ($arr as $key=>$val){
if(is_array($val)){
$xml.="<".$key.">".arrayToXml($val)."</".$key.">";
}else{
$xml.="<".$key.">".$val."</".$key.">";
}
}
$xml.="</root>";
return $xml;
}

I tested it, this is the simplest, fast, supports mostly arrays, and Chinese characters will not be garbled.
Another method is to use DOMDocument to generate xml structure:

function arrayToXml($arr,$dom=0,$item=0){
if (!$dom){
$dom = new DOMDocument("1.0");
}
if(!$item){
$item = $dom->createElement("root");
$dom->appendChild($item);
}
foreach ($arr as $key=>$val){
$itemx = $dom->createElement(is_string($key)?$key:"item");
$item->appendChild($itemx);
if (!is_array($val)){
$text = $dom->createTextNode($val);
$itemx->appendChild($text);
 
}else {
arrayToXml($val,$dom,$itemx);
}
}
return $dom->saveXML();
}

It can also convert arrays into xml, and supports multi-dimensional arrays, and the generated xml Chinese will not be garbled.

PHP converts XML into an array
When doing interface development, you often encounter data submitted to you by others in xml format. Common WeChat interfaces, Alipay interfaces, etc., their interfaces such as sending messages and communication are all in xml format. , then we first find a way to get this xml data, and then convert it into an array.
Suppose we get an XML like this:

<root>
 
<user>
 
月光光abcd</user>
 
<pvs>13002</pvs>
 
 <ips>
 
<baidu_ip>1200</baidu_ip>
 
 <google_ip>1829</google_ip>
 
 </ips>
 
<date>2016-06-01</date>
 
 </root>

Read the xml data through simplexml_load_string() parsing, then convert it to json format first, and then convert it into an array.

function xmlToArray($xml){
 
 //禁止引用外部xml实体
 
libxml_disable_entity_loader(true);
 
$xmlstring = simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA);
 
$val = json_decode(json_encode($xmlstring),true);
 
return $val;
 
}

Call xmlToArray() to get the following results:

After getting the array, we can perform various processing on the data.

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