PHP implode_with_key(); Implode array with key and value

What about: function implode_with_key($assoc, $inglue = ':') {     if(is_array($assoc) && count($assoc)>0)     {         foreach ($assoc as $tk => $tv)         {             $return[] = $tk . $inglue . $tv;         }         return implode(';', $return);     }     return false; }