Create XML string from array

XMLifier.php

<?php
/**
 * @Author neun
 * @since 09.04.2015 21:23
 */
class XMLifier
{
	/**
	 * Regex chars that _dont_ need to be wrapped in CDATA.
	 * @var string
	 */
	private static $noCDATA = '\w\s\%.,+\-:';

	/**
	 * Some extra stuff before we get going.
	 * @param $array
	 * @param string $noCDATA
	 * @return string
	 */
	public static function toXml($array, $noCDATA = null)
	{
		if (!empty($noCDATA))
		{
			self::$noCDATA = $noCDATA;
		}

		return '<?xml version="1.0" encoding="utf-8"?><widgets>' . self::xmlify($array) .'</widgets>';
	}

	/**
	 * Expects an n-dimensional array to be transformed into a XML string.
	 * @param $array
	 * @return null|string
	 */
	private static function xmlify($array)
	{
		$str = null;

		foreach ($array as $name => $value)
		{
			$str .= "<{$name}>";

			if (!is_array($value))
			{
				if (preg_match('/^[' . self::$noCDATA . ']+$/', $value, $m))
				{
					$str .= $value;
				}
				else
				{
					$str .= '<![CDATA[' . $value . ']]>';
				}
			}
			else
			{
					$str .= self::xmlify($value);
			}

			$str .= "</{$name}>";
		}

		return $str;
	}
}

/**
 * My lovable dummy for testing ...
 */
$dummy =
	array(
		'eins' => array(
			'title' => 'SuperXXL Shirt',
			'info' => "That's one friggin awesome shirt there!! <3",
			'attributes' => array(
				'size'  => 'XXL',
				'color' => 'blue',
				'price' => '9.95',
				'discounts' => array(
					'spring' => '10%',
					'summer' => '5%',
					'autumn' => '15%',
					'winter' => '20%',
				)
			)
		),
		'zwei' => array(
			'title' => 'MegaXXS Shirt',
			'attributes' => array(
				'size'  => 'XXS',
				'color' => 'green',
				'price' => '7.95',
				'materials' => array(
					'whool' => '50%',
					'polyester' => '50%'
				)
			),
			'shipping' => array(
				'domestic'	=> '2.95',
				'europe'	=> '4.95',
				'other'		=> '9.99'
			)

		),
		'drei' => array(
			'title' => 'BoringM Shirt',
			'attributes' => array(
				'size'  => 'M',
				'color' => 'yellow',
				'price' => '8.97',
				'some'	=> array(
					'other' => array(
						'funny' => array(
							'value' => array(
								'with' => array(
									'crazy' => array(
										'deep' => array(
											'nesting' => 'lol'
										)
									)
								)
							)
						)
					)
				)
			)
		)
	);

header("Content-type:text/xml");
echo XMLifier::toXml($dummy);