public function __construct(\mysqli $conn, $prepareString)
{
$this->_conn = $conn;
$this->_stmt = $conn->prepare($prepareString);
if (false === $this->_stmt) {
throw new MysqliException($this->_conn->error, $this->_conn->sqlstate, $this->_conn->errno);
}
$paramCount = $this->_stmt->param_count;
if (0 < $paramCount) {
$this->types = str_repeat('s', $paramCount);
$this->_bindedValues = array_fill(1, $paramCount, null);
}
}