php str_split() every n characters with accents

Question

I've this code to split a string every 3 characters, works fine, but accents are messed:

$splitted_array = str_split('waderòrò',3);

but it outputs

print_r($splitted_array ); >> Array ( [0] => wad [1] => er▯ [2] => ▯r▯ [3] => ▯ ) 

I know similar question was already asked, but this question didn't help me. ucwords and french accented lettres encoding. I did try mb_split, but without success, because I wasn't able to find the right regex... What would be the right code?

Answer 1

User "veszelovszki at gmail dot com" posted the below solution to the PHP str_split manual page. It is a multibyte-safe variation of the str_split() function.

function mb_str_split($string, $split_length = 1)
{
    if ($split_length == 1) {
        return preg_split("//u", $string, -1, PREG_SPLIT_NO_EMPTY);
    } elseif ($split_length > 1) {
        $return_value = [];
        $string_length = mb_strlen($string, "UTF-8");
        for ($i = 0; $i < $string_length; $i += $split_length) {
            $return_value[] = mb_substr($string, $i, $split_length, "UTF-8");
        }
        return $return_value;
    } else {
        return false;
    }
}

Answer 2

I was having the same issue today and here is the solution that I am using. It is basicly using regular expressions.

$re = '/\w{3}/u';
$str = 'waderòròцчшщ中华人民共和国';

preg_match_all($re, $str, $matches);

// Print the entire match result
print_r($matches);