access_value_dot / access_value_dot_set

function & access_value_dot($key, &$array) {
    if (is_array($key)) {
        $values = array();
        foreach ($key as $single_key) $values[] = access_value_dot($single_key, $array);
        return $values;
    }
    if (empty($key)) return $array;
    $slices = explode('.', $key);
    foreach ($slices as $slice) $array = &$array[$slice];
    return $array;
}

function access_value_dot_set($key, &$array, $value) {
    if (is_array($key)) {
        $values = array();
        $value = array_values($value);
        foreach (array_values($key) as $k => $single_key) {
            access_value_dot_set($single_key, $array, $value[$k]);
        }
        return;
    }
    $ref = &access_value_dot($key, $array);
    $ref = $value;
}


///////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////

class UtilsTest extends PHPUnit_Framework_TestCase {
    public function testAccessValueDot() {
        $data = array(
            'level1' => array(
                'level2b' => array(
                    'level3' => array(
                        'level4a' => 1,
                        'level4b' => 'Hello World',
                    ),
                ),
                'key' => 2,
            ),
            'level1a' => array(),
        );
        $this->assertEquals(access_value_dot('level1.level2b.level3.level4b', $data), 'Hello World');
        $this->assertEquals(access_value_dot(array(
            'level1.level2b.level3.level4a',
            'level1.level2b.level3.level4b',
            'level1.key',
            'level1a',
            'level1.level2b.level3',
        ), $data), array(
            '1',
            'Hello World',
            '2',
            array(),
            array(
                'level4a' => 1,
                'level4b' => 'Hello World',
            )
        ));
    }

    public function testAccessValueDotSet() {
        $object = (object)array(
            'bbcode' => array(
                'title' => 'Hello [b]World[/b]',
                'descriptions' => array(
                    'short' => 'This is the [b]short[/b] description.',
                    'long'  => 'This is the [b]LONG[/b] description.',
                ),
            ),
            'html' => array(
            ),
        );

        $field_keys = array(
            'title',
            'descriptions.short',
            'descriptions.long',
        );

        // Accessing bbcode values.
        $extracted_values = access_value_dot($field_keys, $object->bbcode);

        {
            // Converting bbcode to html.
            $modified_values = array_map(function($value) {
                return preg_replace_callback('@\\[(\\w+)\\](.*)\\[/\\1\\]@Umsi', function($captures) {
                    list(, $bbcode, $text) = $captures;
                    switch ($bbcode) {
                        case 'b': return '<strong>' . $text . '</strong>';
                        default: throw(new Exception("Unknown bbcode '{$bbcode}'"));
                    }
                }, htmlspecialchars($value));
            }, $extracted_values);
        }

        // Writting bbcode values.
        access_value_dot_set($field_keys, $object->html, $modified_values);

        $this->assertEquals(
            $object->html,
            array(
                'title' => 'Hello <strong>World</strong>',
                'descriptions' => array(
                    'short' => 'This is the <strong>short</strong> description.',
                    'long' => 'This is the <strong>LONG</strong> description.',
                ),
            )
        );
    }
}