php不使用插件导出excel的简单方法

$filename=date("Y年m月d日")."数据信息统计结果.xls";     //文件名
$ua = $_SERVER["HTTP_USER_AGENT"];　　　　　　  //中文文件名不乱码
if (preg_match("/MSIE/", $ua)) {
      $filename=urlencode($filename);
} else if (preg_match("/Firefox/", $ua)) {
      $filename=$filename;
} else {
      $filename=urlencode($filename);
}
header("Content-type:application/vnd.ms-excel");　　　//输出excel头
header("Content-Disposition:filename=".$filename);
$n = iconv('utf-8', 'gbk', '11');　　　　　　　//设置excel表格列
$t = iconv('utf-8', 'gbk', '22');
$k = iconv('utf-8', 'gbk', '33');
$s = iconv('utf-8', 'gbk', '44');
$r= iconv('utf-8', 'gbk', '55');
$a= iconv('utf-8', 'gbk', '66');

echo "{$n}\t";
echo "{$t}\t";
echo "{$k}\t";
echo "{$s}\t";
echo "{$r}\t";
echo "{$a}\t\n";

　　　　　　
foreach($a as $kk=>$pp){　　　　　　　　　　//对每列些数据
foreach($pp['child'] as $k=>$p){
echo iconv("utf-8", "gbk//IGNORE", $pp['u']."\t");
echo iconv("utf-8", "gbk//IGNORE", $p['u']."\t");
echo iconv("utf-8", "gbk//IGNORE", $p['s']."\t");
echo iconv("utf-8", "gbk//IGNORE", $p['t']."\t");
echo iconv("utf-8", "gbk//IGNORE", $p['c']."\t");
echo iconv("utf-8", "gbk//IGNORE", $p['t']."\t\n");
}
}

Array
(
    [0] => Array
        (
[unitid] => 1234
[u] => aaa
[fid] => 1000
[shengid] => 1000
[shiid] => 0
[xianid] => 0
[rid] => 2
[orders] => 50
[sys_createuid] => 1
[sys_createtime] => 1383556976
[sys_updateuid] => 1
[sys_updatetime] => 1389853763
[child] => Array
(
[0] => Array
(
    [unitid] => 1035
    [u] => bbb
    [fid] => 1000
    [shengid] => 1000
    [shiid] => 0
    [xianid] => 0
    [rid] => 2
    [orders] => 50
    [sys_createuid] => 1
    [sys_createtime] => 1383556976
    [sys_updateuid] => 1
    [sys_updatetime] => 1389853763
    [funitname] =>
    [s] => 6
    [t] => 1
    [c] => 1
    [t] => 2
)
           [4] => Array
(
    [u] => 合计
    [s] => 8
    [t] => 1
    [c] => 3
    [t] => 3
))))