//读取文件内容
$_sql = file_get_contents('test.sql');
$_arr = explode(';', $_sql);
$_mysqli = new mysqli(DB_HOST,DB_USER,DB_PASS);
if (mysqli_connect_errno()) {
  exit('连接数据库出错');
}
//执行sql语句
foreach ($_arr as $_value) {
  $_mysqli->query($_value.';');
}
$_mysqli->close();
$_mysqli = null;

CREATE DATABASE IF NOT EXISTS 数据库名 DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci;

$_mysqli->query("CREATE DATABASE IF NOT EXISTS 数据库名 DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci;");
$_mysqli->query("USE 数据库名");