php编译出错，不知道哪里有问题

<?php
echo "<meta charset='utf-8'>";
echo"<link href='style.css'rel='stylesheet'>";
$conn=mysqli_connect("localhost","root","");
mysqli_select_db($conn,"db_admin");
mysqli_query($conn,"set names utf8");
$result=mysqli_query($conn,"select*from tb_admin");
echo"<table border=1>";
echo"<tr align=center><th>用户名</th><th>密码</th><th>电子邮箱</th></tr>";
while($arr=mysqli_fetch_array($result)) {
    echo"<tr><td>".$arr['user']."</td><td>".$arr['password']."</td><td>".$arr['email']."</td><tr>";
}
echo"</table>";
?>

select*from tb_admin

这里太挤了，写成

select * from tb_admin