我希望永久链接像youtube一样，由9位数的字母和数字生成我修改了这个代码

add_filter( \'wp_unique_post_slug\', \'unique_slug_108286\', 10, 4 );
function unique_slug_108286( $slug) { 
    $n=4;
    $slug = bin2hex(random_bytes($n));  //just an example
    return $slug;
}

所以它是有效的，并给了我一个随机的slug，但问题是每次我在后端进入帖子时，这个slug都会发生变化，所以我需要它被生成一次并且是唯一的

我也找到了这个解决方案，它也起作用了，但同样的问题，每次我进入帖子都会改变

add_filter( \'wp_unique_post_slug\', \'unique_slug_so_11762070\', 10, 6 );

function unique_slug_so_11762070( $slug, $post_ID, $post_status, $post_type, $post_parent, $original_slug ) {
    $new_slug = so_11762070_unique_post_slug(\'guid\');
    return $new_slug;
}

# From: https://stackoverflow.com/a/11762698
function so_11762070_unique_post_slug($col,$table=\'wp_posts\'){
     global $wpdb;

     $alphabet = array_merge( range(0, 9), range(\'a\',\'z\') );

     $already_exists = true;
     do {

         $guidchr = array();
         for ($i=0; $i<32; $i++)
         $guidchr[] = $alphabet[array_rand( $alphabet )];


         $guid = sprintf( "%s", implode("", array_slice($guidchr, 0, 12, true)) );

       // check that GUID is unique
       $already_exists = (boolean) $wpdb->get_var("
       SELECT COUNT($col) as the_amount FROM $table WHERE $col = \'$guid\'
       ");

      } while (true == $already_exists);

     return $guid;
}

add_filter( \'wp_unique_post_slug\', \'unique_slug_108286\', 10, 2 );
function unique_slug_108286( $slug, $postId ) {
    if ( ! $postId ) {
        $n = 4;
        $slug = bin2hex( random_bytes( $n ) );  //just an example
    }
    return $slug;
}

add_filter( \'wp_unique_post_slug\', \'unique_slug_108286\', 10, 2 );
function unique_slug_108286( $slug, $postId ) {
    if ( $postId && ! get_post_meta( $postId, \'slug_generated\', true ) ) {
        $n = 4;
        $slug = bin2hex( random_bytes( $n ) );  //just an example
        update_post_meta( $postId, \'slug_generated\', true );
    }
    return $slug;
}

function append_slug($data) {
    global $post_ID;

    if (empty($data[\'post_name\'])) {
        $n=4;
        $data[\'post_name\'] = bin2hex(random_bytes($n));
    }

    return $data;
}