functions.php

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<?php

namespace Sabre\Xml\Serializer;

use InvalidArgumentException;
use Sabre\Xml\Writer;
use Sabre\Xml\XmlSerializable;

function enum(Writer $writer, array $values) {

    foreach ($values as $value) {
        $writer->writeElement($value);
    }
}

function valueObject(Writer $writer, $valueObject, $namespace) {
    foreach (get_object_vars($valueObject) as $key => $val) {
        if (is_array($val)) {
            // If $val is an array, it has a special meaning. We need to
            // generate one child element for each item in $val
            foreach ($val as $child) {
                $writer->writeElement('{' . $namespace . '}' . $key, $child);
            }

        } elseif ($val !== null) {
            $writer->writeElement('{' . $namespace . '}' . $key, $val);
        }
    }
}


function repeatingElements(Writer $writer, array $items, $childElementName) {

    foreach ($items as $item) {
        $writer->writeElement($childElementName, $item);
    }

}

function standardSerializer(Writer $writer, $value) {

    if (is_scalar($value)) {

        // String, integer, float, boolean
        $writer->text($value);

    } elseif ($value instanceof XmlSerializable) {

        // XmlSerializable classes or Element classes.
        $value->xmlSerialize($writer);

    } elseif (is_object($value) && isset($writer->classMap[get_class($value)])) {

        // It's an object which class appears in the classmap.
        $writer->classMap[get_class($value)]($writer, $value);

    } elseif (is_callable($value)) {

        // A callback
        $value($writer);

    } elseif (is_null($value)) {

        // nothing!

    } elseif (is_array($value) && array_key_exists('name', $value)) {

        // if the array had a 'name' element, we assume that this array
        // describes a 'name' and optionally 'attributes' and 'value'.

        $name = $value['name'];
        $attributes = isset($value['attributes']) ? $value['attributes'] : [];
        $value = isset($value['value']) ? $value['value'] : null;

        $writer->startElement($name);
        $writer->writeAttributes($attributes);
        $writer->write($value);
        $writer->endElement();

    } elseif (is_array($value)) {

        foreach ($value as $name => $item) {

            if (is_int($name)) {

                // This item has a numeric index. We just loop through the
                // array and throw it back in the writer.
                standardSerializer($writer, $item);

            } elseif (is_string($name) && is_array($item) && isset($item['attributes'])) {

                // The key is used for a name, but $item has 'attributes' and
                // possibly 'value'
                $writer->startElement($name);
                $writer->writeAttributes($item['attributes']);
                if (isset($item['value'])) {
                    $writer->write($item['value']);
                }
                $writer->endElement();

            } elseif (is_string($name)) {

                // This was a plain key-value array.
                $writer->startElement($name);
                $writer->write($item);
                $writer->endElement();

            } else {

                throw new InvalidArgumentException('The writer does not know how to serialize arrays with keys of type: ' . gettype($name));

            }
        }

    } elseif (is_object($value)) {

        throw new InvalidArgumentException('The writer cannot serialize objects of class: ' . get_class($value));

    } else {

        throw new InvalidArgumentException('The writer cannot serialize values of type: ' . gettype($value));

    }

}