php提取MySQL数据失败

<!DOCTYPE html>

<?php
echo "alert('dfsf');";
?>

My first PHP page

<?php
define(DB_HOST, 'localhost');//地址
define(DB_USER, 'root');//用户名
define(DB_PASS, 'aaa12345');//密码
define(DB_DATABASENAME, 'basd');//库
define(DB_TABLENAME, 'news');//表
$dbcolarray = array('News_ID', 'News_Name', 'News Introduction', 'News Substance');
$conn = mysql_connect(DB_HOST, DB_USER, DB_PASS) or die("connect failed" . mysql_error());
mysql_select_db(DB_DATABASENAME, $conn);
$sql = sprintf("select count(*) from %s", DB_TABLENAME);
$result = mysql_query($sql, $conn);
if ($result)
{$count = mysql_fetch_row($result);
}
else
{
die("query failed");
}
echo "table have $count[0] data
";

$sql = sprintf("select %s from %s", implode(",",$dbcolarray), DB_TABLENAME);
$result = mysql_query($sql, $conn);
echo '

';
$thstr = "";
echo $thstr;
while ($row=mysql_fetch_assoc($result))//与$row=mysql_fetch_assoc($result)等价
{
echo "";
$tdstr = "";
foreach ($dbcolarray as $td)
$tdstr .= "";
echo $tdstr;
echo "";
}
echo "

" . implode("	", $dbcolarray) . "
$row[$td]

";
mysql_free_result($result);
mysql_close($conn);
?>