Converts array keys to dot notated key path

convertArrayToDotNotatedKeyPathArray.php

<?php

class ArrayUtils
{

    /**
     * Konvertiert einen Array so um, das die Schlüssel als Pfad (punkt notiert)
     * umgewandelt werden.
     *
     * <code>
     *
     *  $source = array(
     *    'a' => 1,
     *    'b' => array(
     *      'c' => 2,
     *      'd' => 3
     *    ),
     *    'e' => 4
     *  );
     *
     *  print_r(ArrayUtils::convertArrayToDotNotatedKeyPathArray($source));
     *
     *  Array
     *  (
     *    [a] => 1
     *    [b.c] => 2
     *    [b.d] => 3
     *    [e] => 4
     *  )
     *
     *  print_r(ArrayUtils::convertArrayToDotNotatedKeyPathArray($source,
     * true));
     *
     *  Array
     *  (
     *    [0] => a
     *    [1] => b.c
     *    [2] => b.d
     *    [3] => e
     *  )
     *
     * </code>
     *
     * @param array $array
     * @param bool $ignoreValues
     *
     * @return array
     */
    public static function convertArrayToDotNotatedKeyPathArray(array $array, $ignoreValues = false)
    {
        $iterator = new \RecursiveIteratorIterator(
            new RecursiveArrayIterator($array), \RecursiveIteratorIterator::SELF_FIRST
        );

        $lastDepth = 0;
        $prefix = array();
        $result = array();

        foreach ($iterator as $key => $value) {

            $difference = $lastDepth - $iterator->getDepth();

            if ($difference > 0) {
                while ($difference--) {
                    array_pop($prefix);
                }
            }

            $prefix[] = $key;
            $dotPath = implode('.', $prefix);


            $lastDepth = $iterator->getDepth();

            if (is_array($value)) {

                if(is_string(key($value))){
                    continue;
                } else {
                    if ($ignoreValues) {
                        $result[] = $dotPath;
                    } else {
                        $result[$dotPath] = $value;
                    }
                }

                continue;
            }

            if ($ignoreValues) {
                $result[] = $dotPath;
            } else {
                $result[$dotPath] = $value;
            }

            array_pop($prefix);
        }

        return $result;
    }
}