写了一个比较简单的网内搜索！哈哈

<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<?php
include("conn_inc.php");
?>
<form action="" method="POST">
<select name="v_find">
<option value="cate">类型</option>
<option value="id">id</option>
<option value="title">标题</option>
</select>
<input type="text" name="title"> <input type="submit" value="提交" name="submit">
</form>
<table border="1"  width="90%">
<tr>
<td width="400"> 标题</td>
<td width="200"> 栏目</td>
<td width="400"> 日期</td>
</tr>
<?php
if ($_POST['submit']) {
$title=$_POST['title'];

$v_find= $_POST[v_find];
$query=mysql_query("select * from title where $v_find like '%$title%' order by id desc ");
while ($row=mysql_fetch_array($query)){

echo "<tr>";
echo "<td>$row[title]</td>";
echo "<td>$row[cate]</td>";
echo "<td>$row[datetime]</td>";
echo "</tr>";
}
}
?>
</table>