php获取数据库内容怎么

<?php
//从数据库根据 id 获取颜色
function getColor($db, $id)
{
 if ($result = $db->query("SELECT * FROM color where id='" . $id . "'"))
 {
 $row = $result->fetch_assoc();
 return $row['color'];
 }
 return '#000000';
}
 
$mysqli = new mysqli("localhost", "test", "test", "room");
 
if ($mysqli->connect_error) {
 printf("数据库连接错误: %s\n", mysqli_connect_error());
 exit();
}
 
?>
<table border="1" cellspacing="0">
<tr>
<td bgcolor="<?php echo getColor($mysqli,'1')?>">1</td>
</tr>
<tr>
<td bgcolor="<?php echo getColor($mysqli,'2')?>">2</td>
</tr>
<tr>
<td bgcolor="<?php echo getColor($mysqli,'3')?>">3</td>
</tr>
</table>
 
<?php
 
$mysqli->close();
 
?>