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@ 2015-04-21T21:03:15Z

<?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 attribute="variable">text</sampleChild>
    </sampleElement>
    <sampleElement>
        test
    </sampleElement>
</root>';

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

Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: 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/XOiVD on line 24 { "@attributes": { "attribute": "variable" }, "sampleElement": [ { "sampleChild": [ null, { "@attributes": { "attribute": "variable" }, "@text": "text" } ], "@text": "Text" }, "test" ] }
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30: { "@attributes": { "attribute": "variable" }, "sampleElement": [ { "sampleChild": [ null, { "@attributes": { "attribute": "variable" }, "@text": "text" } ], "@text": "Text" }, "test" ] }
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29: Parse error: syntax error, unexpected '[' in /in/XOiVD on line 43
Process exited with code 255.
Output for 5.0.0 - 5.0.5: Parse error: parse error, unexpected '[' in /in/XOiVD on line 43
Process exited with code 255.
Output for 4.4.2 - 4.4.9: Parse error: syntax error, unexpected T_STRING, expecting '{' in /in/XOiVD on line 8
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1: Parse error: parse error, unexpected T_STRING, expecting '{' in /in/XOiVD on line 8
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error, expecting `'{'' in /in/XOiVD on line 8
Process exited with code 255.

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