Question

I have to convert a UTF-8 string to non UTF-8 string, I want to replace:

Ậ,Ẫ,Ẩ,Ầ,Ấ,Â,Ặ,Ẵ,Ẳ,Ằ,Ắ,Ă,Ạ,Ã,Ả,À,Á to A,

Ự,Ữ,Ử,Ừ,Ứ,Ư,Ụ,Ũ,Ủ,Ù,Ú to U,

Ợ,Ỡ,Ở,Ờ,Ớ,Ơ,Ộ,Ỗ,Ổ,Ồ,Ố,Ô,Ọ,Õ,Ỏ,Ò,Ó to O… and much more with same case

By php preg_replace() ?

May I use ?:

$string = preg_replace('/Ậ,Ẫ,Ẩ,Ầ,Ấ,Â,Ặ,Ẵ,Ẳ,Ằ,Ắ,Ă,Ạ,Ã,Ả,À,Á/', 'A', $string);
$string = preg_replace('/Ợ,Ỡ,Ở,Ờ,Ớ,Ơ,Ộ,Ỗ,Ổ,Ồ,Ố,Ô,Ọ,Õ,Ỏ,Ò,Ó/', 'O', $string);
$string = preg_replace('/Ự,Ữ,Ử,Ừ,Ứ,Ư,Ụ,Ũ,Ủ,Ù,Ú/', 'U', $string);

Answer 1

You can, if you remove the ,, place everything inside a character class, and add the /u modifier if the input string is UTF-8. Example:

preg_replace('/[ỰỮỬỪỨƯỤŨỦÙÚ]/u', 'U', $string);

You can also use str_replace():

str_replace(array('Ự', 'Ữ', ...), 'U', $string);

or strtr():

strtr($string, 'ỰỮỬ', 'UUU');