Example analysis of how php converts json format into xml format

With the development of the times and the advancement of technology, our Internet world has become more and more complex, and the formats of data have become more and more diverse. In the process of transmitting and processing data, Json and Xml are two typical data formats. In Php, Json and Xml are relatively common data formats, but sometimes we may need to convert Json to Xml. This article will introduce how to use Php to convert Json to Xml.

1. The difference between Json and Xml

Json and Xml are both data formats used for data formatting and exchange, but there are some obvious differences between the two.

Json (JavaScript Object Notation) is a lightweight data exchange format that is easy for humans to read and write. Json is presented in the form of key-value pairs, and there are corresponding Json parsers in many programming languages. In the Json data format, curly brackets are used to contain object attributes, square brackets represent arrays, and commas are used to separate different key-value pairs. The Json data format is currently widely used in the development of web applications and mobile applications because of its simplicity, clarity, and ease of reading and use.

Xml (Extensible Markup Language) is a general markup language used for data representation and transmission. Xml tags can support nesting, attributes, namespaces and other functions. In the Xml data format, left and right angle brackets are used to represent labels, and backslash escape characters are used to represent special characters. The Xml data format is currently widely used in data exchange between various enterprises because of its extensibility, clear semantics, and good understandability.

2. Use Php to convert Json to Xml

In Php, you can use the SimpleXMLElement class to convert Json to Xml. SimpleXMLElement is a suitable class for processing Xml. Php5 and above versions install and enable this extension by default. The sample code is as follows:

$json = '{"name":"Tom","age":29,"gender":"male"}';
$xml = new SimpleXMLElement('<root></root>');
array_walk_recursive(json_decode($json, true), array($xml, 'addChild'));
echo $xml->asXML();

Explain the above code. First, a Json string, $json, is defined. Then use the SimpleXMLElement class to create an Xml object, $xml. Then use the array_walk_recursive() function to call the method addChild() one by one to add nodes to the array parsed by the json_decode() function. Finally, use the function asXML() to convert the xml object into a string for output.

3. Json contains array nesting

The above example only parses a simple Json object. If Json contains complex data structures, such as array nesting, you need to use recursion. method.

The following is an example of a Json string containing a nested array:

{
    "id": "1",
    "name": "Jack",
    "skills": [
        {
            "id": "1",
            "skill_name": "php"
        },
        {
            "id": "2",
            "skill_name": "javascript"
        }
    ]
}

To convert the above Json string into Xml, you can use the following sample code:

$json = '{
    "id": "1",
    "name": "Jack",
    "skills": [
        {
            "id": "1",
            "skill_name": "php"
        },
        {
            "id": "2",
            "skill_name": "javascript"
        }
    ]
}';
$data = json_decode($json, true);
$xml = new SimpleXMLElement('');
array_walk_recursive($data, array($xml, 'addChild'));
echo $xml->asXML();

Explain this code. First, a Json string containing array nesting is defined, $json. Then use the json_decode() function to parse the Json string into an array and save it in the variable $data. Then use SimpleXMLElement to create an Xml object, $xml. Finally, use the array_walk_recursive() function to traverse each element in $data, and use the addChild() method to add the key/value pair to the $xml object. Finally, use the asXML() function to convert the Xml object into a string and output it.

4. Conclusion

This article introduces in detail how to use Php to convert Json format data into Xml. To summarize, using the SimpleXMLElement class can more easily process data in Xml format. When converting Json data into Xml data, the original Json data needs to be recursively traversed. In actual applications, certain modifications and extensions need to be made according to specific needs to meet the needs of actual business logic.

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