Detailed explanation of conversion examples between PHP arrays and XML

This article mainly introduces how to use PHP to process the conversion between arrays and XML. It introduces in detail how PHP converts XML into arrays and how PHP converts arrays into XML. Interested friends can refer to it.

In development, we often encounter the conversion between arrays and XML, especially when dealing with interface development. For example, the other client POSTs data in XML format to the server, and the server The program on it is responsible for receiving and parsing, and also needs to provide the 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.

Source code download: Conversion between PHP array and XML

PHP converts the array into XML
PHP can convert the array into xml format, the simple way is totraverse 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, and this works best It is simple, 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, generating The Chinese xml 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, such as common WeChat interfaces, Alipay interfaces, etc. Their interfaces such as Send Message are all in xml format, so 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>

Parse and read xml data through simplexml_load_string(), 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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