Php json sang xml

$a = array('',"'bar'",'"baz"','&blong&', "\xc3\xa9");

echo "Normal: ",  json_encode($a), "\n";
echo "Tags: ",    json_encode($a, JSON_HEX_TAG), "\n";
echo "Apos: ",    json_encode($a, JSON_HEX_APOS), "\n";
echo "Quot: ",    json_encode($a, JSON_HEX_QUOT), "\n";
echo "Amp: ",     json_encode($a, JSON_HEX_AMP), "\n";
echo "Unicode: ", json_encode($a, JSON_UNESCAPED_UNICODE), "\n";
echo "All: ",     json_encode($a, JSON_HEX_TAG | JSON_HEX_APOS | JSON_HEX_QUOT | JSON_HEX_AMP | JSON_UNESCAPED_UNICODE), "\n\n";

$b = array();

echo "Empty array output as array: ", json_encode($b), "\n";
echo "Empty array output as object: ", json_encode($b, JSON_FORCE_OBJECT), "\n\n";

$c = array(array(1,2,3));

echo "Non-associative array output as array: ", json_encode($c), "\n";
echo "Non-associative array output as object: ", json_encode($c, JSON_FORCE_OBJECT), "\n\n";

$d = array('foo' => 'bar', 'baz' => 'long');

echo "Associative array always output as object: ", json_encode($d), "\n";
echo "Associative array always output as object: ", json_encode($d, JSON_FORCE_OBJECT), "\n\n";
?>

Ví dụ trên sẽ xuất ra

________số 8_______

function SimpleXMLElement_append($parent, $child)
{
    // get all namespaces for document
    $namespaces = $child->getNamespaces(true);

    // check if there is a default namespace for the current node
    $currentNs = $child->getNamespaces();
    $defaultNs = count($currentNs) > 0 ? current($currentNs) : null;
    $prefix = (count($currentNs) > 0) ? current(array_keys($currentNs)) : '';
    $childName = strlen($prefix) > 1
        ? $prefix . ':' . $child->getName() : $child->getName();

    // check if the value is string value / data
    if (trim((string) $child) == '') {
        $element = $parent->addChild($childName, null, $defaultNs);
    } else {
        $element = $parent->addChild(
            $childName, htmlspecialchars((string)$child), $defaultNs
        );
    }

    foreach ($child->attributes() as $attKey => $attValue) {
        $element->addAttribute($attKey, $attValue);
    }
    foreach ($namespaces as $nskey => $nsurl) {
        foreach ($child->attributes($nsurl) as $attKey => $attValue) {
            $element->addAttribute($nskey . ':' . $attKey, $attValue, $nsurl);
        }
    }

    // add children -- try with namespaces first, but default to all children
    // if no namespaced children are found.
    $children = 0;
    foreach ($namespaces as $nskey => $nsurl) {
        foreach ($child->children($nsurl) as $currChild) {
            SimpleXMLElement_append($element, $currChild);
            $children++;
        }
    }
    if ($children == 0) {
        foreach ($child->children() as $currChild) {
            SimpleXMLElement_append($element, $currChild);
        }
    }
}

The BIGGEST differece between an XML and a PHP array is that in an XML file, the name of elements can be the same even if they are siblings, eg. "", while in an PHP array, the key of which must be different.

I think the array structure developed by svdmeer can fit for XML, and fits well.

here is an example array converted from an xml file:
array(
"@tag"=>"name",
"@attr"=>array(
    "id"=>"1","class"=>"2")
"@text"=>"some text",
)

or if it has childrens, that can be:

array(
"@tag"=>"name",
"@attr"=>array(
    "id"=>"1","class"=>"2")
"@items"=>array(
    0=>array(
        "@tag"=>"name","@text"=>"some text"
    )
)

Also, I wrote a function that can change that array back to XML.

function array2XML($arr,$root) {
$xml = new SimpleXMLElement("<{$root}>");
$f = create_function('$f,$c,$a','
        foreach($a as $v) {
            if(isset($v["@text"])) {
                $ch = $c->addChild($v["@tag"],$v["@text"]);
            } else {
                $ch = $c->addChild($v["@tag"]);
                if(isset($v["@items"])) {
                    $f($f,$ch,$v["@items"]);
                }
            }
            if(isset($v["@attr"])) {
                foreach($v["@attr"] as $attr => $val) {
                    $ch->addAttribute($attr,$val);
                }
            }
        }');
$f($f,$xml,$arr);
return $xml->asXML();
}
?>