Hooray!
protected function removeVNeseAccents ($str){
$unicode = array(
'a'=>'á|à|ả|ã|ạ|ă|ắ|ặ|ằ|ẳ|ẵ|â|ấ|ầ|ẩ|ẫ|ậ',
'd'=>'đ',
'e'=>'é|è|ẻ|ẽ|ẹ|ê|ế|ề|ể|ễ|ệ',
'i'=>'í|ì|ỉ|ĩ|ị',
'o'=>'ó|ò|ỏ|õ|ọ|ô|ố|ồ|ổ|ỗ|ộ|ơ|ớ|ờ|ở|ỡ|ợ',
'u'=>'ú|ù|ủ|ũ|ụ|ư|ứ|ừ|ử|ữ|ự',
'y'=>'ý|ỳ|ỷ|ỹ|ỵ',
'A'=>'Á|À|Ả|Ã|Ạ|Ă|Ắ|Ặ|Ằ|Ẳ|Ẵ|Â|Ấ|Ầ|Ẩ|Ẫ|Ậ',
'D'=>'Đ',
'E'=>'É|È|Ẻ|Ẽ|Ẹ|Ê|Ế|Ề|Ể|Ễ|Ệ',
'I'=>'Í|Ì|Ỉ|Ĩ|Ị',
'O'=>'Ó|Ò|Ỏ|Õ|Ọ|Ô|Ố|Ồ|Ổ|Ỗ|Ộ|Ơ|Ớ|Ờ|Ở|Ỡ|Ợ',
'U'=>'Ú|Ù|Ủ|Ũ|Ụ|Ư|Ứ|Ừ|Ử|Ữ|Ự',
'Y'=>'Ý|Ỳ|Ỷ|Ỹ|Ỵ',
);
foreach($unicode as $nonUnicode=>$uni){
$str = preg_replace("/($uni)/i", $nonUnicode, $str);
}
return strtolower($str);
}
protected function getSkipAccents(string $str, string $charset = 'utf-8'): string
{
return $this->removeVNeseAccents($str);
}
Done!