PHP 导出excel 简单代码

<?php
    header("Content-type:application/vnd.ms-excel");
    header("Content-Disposition:filename=csat.xls");
    $str = "<table border=1><tr>";
    $str .= "<th>id</th><th>name</th><th>data</th>";
    $str .= "</tr>";
    $str .= "<tr>";
    $str .= "<td>1</td>";
    $str .= "<td>ceshi</td>";
    $str .= "<td>2015-09-14</td>";
    $str .= "</tr>";
    $str .= "</table>";
    echo $str;
    exit;