dikini.net

function db_get_something( $x ) {
  static $cache = array();

  if(empty($cache[$x])) { 
    $cache[$x] = //some db query result;
  }
  return $cache[$x];
}

class db_get_somethning {
  private $cache = array();

  function func() {
    if(empty($this->cache[$x])) 
this->cache[$x] = //some db query result;
    return $this->cache[$x];
  }
}