php class Database extends PDO function __construct parent __construct

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<?php
class Database extends PDO
{
function __construct()
{
parent::__construct('mysql:dbname=test;host=localhost', 'root', '');
$this->setAttribute(PDO::ATTR_STATEMENT_CLASS, array('DBStatement', array($this)));
}
}
class DBStatement extends PDOStatement
{
public $dbh;
protected function __construct($dbh)
{
$this->dbh = $dbh;
$this->setFetchMode(PDO::FETCH_OBJ);
}
public function foundRows()
{
$rows = $this->dbh->prepare('SELECT found_rows() AS rows', array(PDO::MYSQL_ATTR_USE_BUFFERED_QUERY => TRUE));
$rows->execute();
$rowsCount = $rows->fetch(PDO::FETCH_OBJ)->rows;
$rows->closeCursor();
return $rowsCount;
}
}
?>