PHP输出文件头异常

PHP输出文件头错误
本地 nginx 1.09 测试一切正常,上传到服务器 nginx 1.12, 在选择文本输出时就报错
完整代码:

PHP code

<!--Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--><?php @$id=$_GET['id']?$_GET['id']:'a';    @$txt=$_GET['txt']?$_GET['txt']:'';    $trees=array();    $trees["a"]="苹果";    $trees["b"]="香蕉";    $trees[3]="樱桃";if($txt){    header('Content-Disposition: attachment; filename="'.$trees[$id].'.txt"');    header('Content-type: text/'.($txt?'plain':'html').'; charset=utf-8');    echo '您选择种了:'.$trees[$id].'树';    die();}else{    echo '<h3>您选择种了:'.$trees[$id].'树';?>

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