php 连接本地数据库

$mysql_conf = array(
  'host'  => '127.0.0.1:3306', 
  'db'   => 'daywrite', 
  'db_user' => 'root', 
  'db_pwd' => '123456', 
  );

$mysqli = @new mysqli($mysql_conf['host'], $mysql_conf['db_user'], $mysql_conf['db_pwd']);
if ($mysqli->connect_errno) {
  die("could not connect to the database:
" . $mysqli->connect_error);//诊断连接错误
}
$mysqli->query("set names 'utf8';");//编码转化
$select_db = $mysqli->select_db($mysql_conf['db']);
if (!$select_db) {
  die("could not connect to the db:
" . $mysqli->error);
}$sql = "select * from dw_user WHERE id = 6262";
$res = $mysqli->query($sql);
if (!$res) {
  die("sql error:
" . $mysqli->error);
}
 while ($row = $res->fetch_assoc()) {
   echo json_encode($row);
  }

$res->free();
$mysqli->close();