Big arabic permalinks not work

Question

I have error in permalink, I have post that title is big like :-

مراجعة : Sony Xperia Z2 و إيجابياته و سلبياته و كل ما تريد معرفته عن الجهاز !

Now when open the post in my site i see permalink like :-

www.domain.com/مراجعة-sony-xperia-z2-و-إيجابياته-و-سلبياته-و-كل-ما

Its read only 11 word

But i set the permalink structure is /%postname%/.

Why its not get all post title ?

update:-

I search and see this code that solved my problem :-

// first of all lets remove standard hook
remove_filter( 'sanitize_title', 'sanitize_title_with_dashes' );

// add our custom hook 
add_filter( 'sanitize_title', 'wpse8170_sanitize_title_with_dashes', 10, 3 );
function wpse8170_sanitize_title_with_dashes( $title, $raw_title = '', $context = 'display' ) {
    $title = strip_tags($title);
    // Preserve escaped octets.
    $title = preg_replace('|%([a-fA-F0-9][a-fA-F0-9])|', '---$1---', $title);
    // Remove percent signs that are not part of an octet.
    $title = str_replace('%', '', $title);
    // Restore octets.
    $title = preg_replace('|---([a-fA-F0-9][a-fA-F0-9])---|', '%$1', $title);

    if (seems_utf8($title)) {
        if (function_exists('mb_strtolower')) {
            $title = mb_strtolower($title, 'UTF-8');
        }
        $title = utf8_uri_encode($title, 1000); // <--- here is the trick!
    }

    $title = strtolower($title);
    $title = preg_replace('/&.+?;/', '', $title); // kill entities
    $title = str_replace('.', '-', $title);

    if ( 'save' == $context ) {
        // Convert nbsp, ndash and mdash to hyphens
        $title = str_replace( array( '%c2%a0', '%e2%80%93', '%e2%80%94' ), '-', $title );

            // Strip these characters entirely
            $title = str_replace( array(
            // iexcl and iquest
            '%c2%a1', '%c2%bf',
            // angle quotes
            '%c2%ab', '%c2%bb', '%e2%80%b9', '%e2%80%ba',
            // curly quotes
            '%e2%80%98', '%e2%80%99', '%e2%80%9c', '%e2%80%9d',
            '%e2%80%9a', '%e2%80%9b', '%e2%80%9e', '%e2%80%9f',
            // copy, reg, deg, hellip and trade
            '%c2%a9', '%c2%ae', '%c2%b0', '%e2%80%a6', '%e2%84%a2',
            // grave accent, acute accent, macron, caron
            '%cc%80', '%cc%81', '%cc%84', '%cc%8c',
        ), '', $title );

        // Convert times to x
        $title = str_replace( '%c3%97', 'x', $title );
    }

    $title = preg_replace('/[^%a-z0-9 _-]/', '', $title);
    $title = preg_replace('/\s+/', '-', $title);
    $title = preg_replace('|-+|', '-', $title);
    $title = trim($title, '-');

    return $title;
}

Answer 1

It depends on what encoding you are using. If you look at the database structure of wp_posts, you will see that post_name field is varchar(200)

So, at most it can store 200 bytes of data. If you are using UTF-16 encoding, it needs 4 bytes to store an Arabic character. So, at most it can store 50 Arabic characters.

For different encoding, it will be different. See https://stackoverflow.com/questions/4322191/how-many-bytes-do-we-need-to-store-an-arabic-character