public static function singleton()
{
if (!isset(self::$instance)) {
$c = __CLASS__;
self::$instance = new $c();
}
return self::$instance;
}
/**
* @param string|array|object $type
* @param string $host
* @param string $username
* @param string $password
* @param string $dbname
* @param int $port
* @param string $charset
*/
public function __construct($type, $host = null, $username = null, $password = null, $dbname = null, $port = null, $charset = null)
{
if (is_array($type)) {
// if params were passed as array
$this->connectionParams = $type;
} elseif (is_object($type)) {
// if type is set as pdo object
$this->pdo = $type;
} else {
foreach ($this->connectionParams as $key => $param) {
if (isset(${$key}) && !is_null(${$key})) {
$this->connectionParams[$key] = ${$key};
}
}
}
if (isset($this->connectionParams['prefix'])) {
$this->setPrefix($this->connectionParams['prefix']);
}
if (isset($this->connectionParams['isSubQuery'])) {
$this->isSubQuery = true;
return;
}
self::$instance = $this;
}
