问一下我的用户查询的PHP代码哪里有错，echo里的$keywords不显示出来
<?php
$keywords = isset($_GET['keywords']) ? trim($_GET['keywords']) : '';
$conn = @mysql_connect('localhost','root','admin')or die('数据库连接失败');
mysql_query('use phpvideo');
mysql_query('set names utf8');
$sql = "SELECT * FROM t_one WHERE username LIKE '%{$keywords}%'";
$rs = mysql_query($sql);
$users = array();
if(!empty($keywords)){
while($row = mysql_fetch_assoc($rs)){
$users[]= $row;
}
}
print_r($users);
?>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>ee</title>
</head>
<body>
<h1>22</h1>
<form action="" method="POST">
xx:<input type="text" name="keywords" value="" />
<input type="submit" value="tjbd" />
</form>
<?php
echo '<h3>查询关键字 <font color="red">'.$keywords.'</font>的结果</h3>';
if($users){
echo '<table width="500" border="1" cellpadding="5"';
echo '<tr><th>用户></th></tr>';
//这里有个FOR循环我就不写了，写了也没用
echo '</table>';
}else{
echo '没有用户';
}
?>
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