Fully support unicode

Requires database changes

Adds support for emoji

classes/mysql.class.php

         $this->halt('Connection failed (host:'.$this->Server.':'.$this->Port.')');
       }
     }
-    mysqli_set_charset($this->LinkID, "utf8");
+    mysqli_set_charset($this->LinkID, "utf8mb4");
   }
 
   function prepare_query($Query, &...$BindVars) {

classes/util.php

   if ($Str != '' && !is_number($Str)) {
     $Str = Format::make_utf8($Str);
     $Str = mb_convert_encoding($Str, 'HTML-ENTITIES', 'UTF-8');
-    $Str = preg_replace("/&(?![A-Za-z]{0,4}\w{2,3};|#[0-9]{2,5};)/m", '&', $Str);
+    $Str = preg_replace("/&(?![A-Za-z]{0,4}\w{2,3};|#[0-9]{2,6};)/m", '&', $Str);
 
     $Replace = array(
       "'",'"',"<",">",