PHP如何查询MySQL数据页面并输出内容到页面，并另存为CSV或EXCEL文件

<?​
header("Content-type:text/html;charset=utf-8");
/**
* mysql connection configure
* 2016-04-09
* Ron
*/
$ychat_host = "localhost";
$ychat_username = "root";
$ychat_password = "";
$ychat_database = "talk";

$con = mysql_connect($ychat_host,$ychat_username,$ychat_password) or die ("connection MySQL failed!");
//select database
mysql_select_db($ychat_database,$con);
//sql
$sql = "select  id,username,password,sex,address,country from userinfo ";
//set encode
mysql_query("set names utf8");
//query results
$result = mysql_query($sql) or die ("query failed! "+mysql_error);
//count
$count = mysql_num_rows($result);
// number of rows
$rows = mysql_affected_rows($con);
// Number of colums
$colums = mysql_num_fields($result);
if($count==0){
echo "no result!";
}else{
echo "total:".$count;
echo "<table border='1' style='border-collapse:collapse;border:1px solid red;'  cellpadding='1' cellspacing='1'>";
echo "<tr>";
for($i = 0;$i < $colums; $i++){

$fieldName = mysql_field_name($result, $i);
echo "<th>$fieldName</th>";

}
echo "</tr>";
while($row=mysql_fetch_row($result)){
echo "<tr>";
for($i=0; $i<$colums; $i++){
echo "<td>$row[$i]</td>";
}
echo "</tr>";
}
echo "</table>";
}

// release result set
mysql_free_result($result);
//close connection
mysql_close($con);
?>

<?
header("Content-type:text/html;charset=utf-8");
/**
* mysel connection configure
* 2016-04-09
* Ron
*/
$ychat_host = "localhost";
$ychat_username = "root";
$ychat_password = "";
$ychat_database = "talk";

$con = mysql_connect($ychat_host,$ychat_username,$ychat_password) or die ("connection MySQL failed!");
//select database
mysql_select_db($ychat_database,$con);
//sql
$sql = "select  id,username,password,sex,address,country from userinfo";
//set encode
mysql_query("set names utf8");
//query results
$result = mysql_query($sql) or die ("query failed! "+mysql_error);
//count
$count = mysql_num_rows($result);

if($count==0){
echo "no result!";
}else{
echo "<table border='1' style='border-collapse:collapse;border:1px solid red;'  cellpadding='1' cellspacing='1'>";
echo "<tr>";
echo "<th>id</th><th>用户名</th><th>性别</th><th>地址</th><th>国家</th>";
echo "</tr>";
while ($userinfo = mysql_fetch_array($result)) {
$id= $userinfo["id"];
$name= $userinfo["username"];
$sex= $userinfo["sex"];
$address= $userinfo["address"];
$country= $userinfo["country"];
echo "<tr>";
echo "<td>$id</td><td>$name</td><td>$sex</td><td>$address</td><td>$country</td>";
echo "</tr>";
}
echo "</table>";

}

// release result set
mysql_free_result($result);
//close connection
mysql_close($con);
?>