public function getUniqueName($parent_id, $preferred_name)
{
$preferred_name = $this->normalizeName($preferred_name);
$pos_of_hyphen = UTF8String::strrpos($preferred_name, '-');
if ($pos_of_hyphen !== false) {
if ($pos_of_hyphen > 0) {
$number_part = UTF8String::substr($preferred_name, $pos_of_hyphen + 1);
if (is_numeric($number_part)) {
$preferred_name = UTF8String::substr($preferred_name, 0, $pos_of_hyphen);
}
}
}
if ($this->isValidName($preferred_name)) {
if (!$this->nameExists($parent_id, $preferred_name)) {
return $preferred_name;
} else {
$existing = Db::get('SELECT id, name FROM [prefix]pages WHERE `name` LIKE :pattern', array(':pattern' => $preferred_name . '-%'));
$highest_number = 0;
if ($existing !== false) {
if (count($existing) > 0) {
foreach ($existing as $element) {
$number_part = UTF8String::substr($element['name'], UTF8String::strlen($preferred_name . '-'));
if (is_numeric($number_part)) {
if ((int) $number_part > $highest_number) {
$highest_number = (int) $number_part;
}
}
}
}
}
if ($highest_number < 2) {
$highest_number = 2;
} else {
$highest_number++;
}
if (!$this->nameExists($parent_id, $preferred_name . '-' . $highest_number)) {
return $preferred_name . '-' . $highest_number;
}
}
}
return md5(uniqid(rand(0, 99999), true));
}
