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@ 2015-04-21T20:59:35Z

<?php

/**
 * Class JsonSimpleXMLElementDecorator
 *
 * Implement JsonSerializable for SimpleXMLElement as a Decorator
 */
class JsonSimpleXMLElementDecorator implements JsonSerializable
{
    /**
     * @var SimpleXMLElement
     */
    private $subject;
 
    public function __construct(SimpleXMLElement $element) {
        $this->subject = $element;
    }
 
    /**
     * Specify data which should be serialized to JSON
     *
     * @return mixed data which can be serialized by json_encode.
     */
    public function jsonSerialize() {
        $subject = $this->subject;
 
        $array = array();
 
        // json encode attributes if any.
        if ($attributes = $subject->attributes()) {
            $array['@attributes'] = array_map('strval', iterator_to_array($attributes));
        }
 
        // traverse into children if applicable
        $children = $subject;
 
        // json encode child elements if any. group on duplicate names as an array.
        foreach ($children as $name => $element) {
            $decorator = new self($element);
 
            if (isset($array[$name])) {
                if (!is_array($array[$name])) {
                    $array[$name] = [$array[$name]];
                }
                $array[$name][] = $decorator;
            } else {
                $array[$name] = $decorator;
            }
        }
 
        // json encode non-whitespace element simplexml text values.
        $text = trim($subject);
        if (strlen($text)) {
            if ($array) {
                $array['@text'] = $text;
            } else {
                $array = $text;
            }
        }
 
        // return empty elements as NULL (self-closing or empty tags)
        if (!$array) {
            $array = NULL;
        }
 
        return $array;
    }
}

$buffer = '<?xml version="1.0"?>
<root attribute="variable">
   <sampleElement>
        Text
        <sampleChild />
        <sampleChild />
    </sampleElement>
    <sampleElement>
        test
        <sampleChild attribute="variable">text</sampleChild>
    </sampleElement>
</root>';

$xml = new SimpleXMLElement($buffer);
$xml = new JsonSimpleXMLElementDecorator($xml);
 
echo json_encode($xml, JSON_PRETTY_PRINT), "\n";

Output for git.master, git.master_jit, rfc.property-hooks: Deprecated: Return type of JsonSimpleXMLElementDecorator::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/bpNga on line 24 { "@attributes": { "attribute": "variable" }, "sampleElement": [ { "sampleChild": [ null, null ], "@text": "Text" }, { "sampleChild": { "@attributes": { "attribute": "variable" }, "@text": "text" }, "@text": "test" } ] }

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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