Strict Standards: Static function DAO::makeItem() should not be abstract in - abstract

Question

I have this code, in file that have the name dao.abstract.class.php, but I am getting this error when I surf the site, and admin panel. Strict Standards: Static function DAO::makeItem() should not be abstract in dao.abstract.class.php on line 15
<?php
abstract class DAO
{
protected $m_sql;
protected $m_sqlId = -1;
protected $m_orderBy;
protected $m_orderByField;
protected $m_orderByType;
**abstract public function selectFromId($iditem);
abstract public function delete($iditem);
abstract public function save($object);
abstract static function makeItem($resultRow);
abstract protected function createSql();**
protected function __construct($sql, $sortField, $sortType)
{
$this->m_sql = $sql;
$this->m_orderBy = array($sortField => $sortType);
$this->m_orderByField = $sortField;
$this->m_orderByType = $sortType;
}
public function setOrderBy($order_by, $field, $type)
{
$this->m_orderBy = $order_by;
$this->m_orderByField = $field;
$this->m_orderByType = $type;
}
public function getOrderBy()
{
return $this->m_orderBy;
}
public function getOrderByField()
{
return $this->m_orderByField;
}
public function getOrderByType()
{
return $this->m_orderByType;
}
protected function executeQuery($objectArray = true, $renew = false)
{
if ($result = mysql_query($this->m_sql->getCommand($this->m_sqlId)))
{
if($objectArray == true)
{
$item = array();
while($row = mysql_fetch_assoc($result))
$item[] = $this->makeComplexItem($row);
}
elseif($row = mysql_fetch_assoc($result))
$item = $this->makeComplexItem($row);
else
$item = null;
}
else
Die(mysql_error().'<br/>'.$this->m_sql->getCommand());
mysql_free_result($result);
if($renew == true)
$this->m_sqlId = -1;
return $item;
}
protected function executeOneFieldQuery($array = true)
{
if ($result = mysql_query($this->m_sql->getCommand()))
{
if($array == true)
{
$item = array();
while($row = mysql_fetch_row($result))
$item[] = $row[0];
}
elseif($row = mysql_fetch_row($result))
$item = $row[0];
else
$item = null;
mysql_free_result($result);
return $item;
}
else
Die(mysql_error());
}
protected function executeSave($itemId)
{
if($itemId == -1)
$this->m_sql->setExecMode(Clarity::EXEC_INSERT);
else
$this->m_sql->setExecMode(Clarity::EXEC_UPDATE);
if ($itemId == -1 AND mysql_query($this->m_sql->getCommand()))
return mysql_insert_id();
elseif($itemId > 0 AND mysql_query($this->m_sql->getCommand()))
return $itemId;
else
Die(mysql_error().'<br/>'.$this->m_sql->getCommand());
}
protected function executeDelete()
{
$this->m_sql->setExecMode(Clarity::EXEC_DELETE);
if(mysql_query($this->m_sql->getCommand()))
return mysql_affected_rows();
else
die(mysql_error());
}
}
?>

Answer 1

You can move this declaration to an interface.
Like this:
interface myInterface
{
static function makeItem($resultRow);
}
abstract class DAO implements myInterface
{
[...]
}