06-面向对象，使用mysqli遍历数据库

<?php

header("Content-type:text/html;charset=utf-8");
//mysqli操作mysql数据库（面向对象）

//1.创建mysqli对象
$mysqli=new Mysqli("localhost","root","root","worddb");
//验证是否ok
if($mysqli->connect_error){
die("连接失败".$mysqli->connect_error);
}else{
echo "链接ok<br/>";

}
//2.操作数据库
$sql="select * from words";
//$res是结果集.mysqli  result
$res=$mysqli->query($sql);
//3.处理结果
while($row=$res->fetch_row()){
foreach($row as $key=>$val){
echo "--$val";
}
echo "<br/>";
}
//4.关闭资源
$res->free();

?>