表单关键字查询写法

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>

<body>

<hl>表单的关键字查询</h1>

<div>
请输入查询的名字：<input type="text" name="name" />
<input type="submit" value="查询" />
</div>

</form>

<?php

//实现两个逻辑
//1.如果没有POST数据，查询所有
//2.如果有POST数据，根据条件查询

$db = new MySQLi("localhost","root","密码","数据库名字");

$tj = " 1 = 1 "; //默认条件
if(!empty($_POST))
{
$name = $_POST['name'];
$tj = " name like '%{$name}%' ";
}

//将条件拼接到SQL语句
$sql = "select * from 表名 where {$tj}";
$result = $db -> query($sql);

while($arr = $result -> fetch_row())
{
//关键字的特殊显示
$name; $arr[1];
$str = str_replace($name,"<mark>{$name}</mark>",$arr[1]);

echo "<tr>
<td>{$arr[0]}</td>
<td>{$str}</td>
<td>{$arr[2]}</td>
<td>{$arr[3]}</td>
<td>{$arr[5]}</td>
</tr>";
}

</table>

</body>
</html>

效果图：

查询张