无法在服务器上生成excel文件

我正在尝试使用以下代码生成发票。

它在本地主机工作正常,

当我执行我的朋友服务器中的代码,它工作正常,

在相同的代码无法在我的服务器中生成 – (使用godaddy)

我是否需要修改任何服务器设置?

<?php include("includes/DbConfig.php"); $SQL = "SELECT id,user_mobile,user_email FROM users limit 1,2"; $header = ''; $result =''; $exportData = mysql_query ($SQL ) or die ( "Sql error : " . mysql_error( ) ); $fields = mysql_num_fields ( $exportData ); for ( $i = 0; $i < $fields; $i++ ) { $header .= mysql_field_name( $exportData , $i ) . "\t"; } while( $row = mysql_fetch_row( $exportData ) ) { $line = ''; foreach( $row as $value ) { if ( ( !isset( $value ) ) || ( $value == "" ) ) { $value = "\t"; } else { $value = str_replace( '"' , '""' , $value ); $value = '"' . $value . '"' . "\t"; } $line .= $value; } $result .= trim( $line ) . "\n"; } $result = str_replace( "\r" , "" , $result ); if ( $result == "" ) { $result = "\nNo Record(s) Found!\n"; } header("Content-type: application/octet-stream"); header("Content-Disposition: attachment; filename=export.xls"); header("Pragma: no-cache"); header("Expires: 0"); print "$header\n$result"; ?> 

我刚刚添加了ob_get_clean(); 并开始工作

 <?php ob_start(); session_start(); include("includes/DbConfig.php"); ?> <?php header("Content-type: application/octet-stream"); header("Content-Disposition: attachment; filename=export.xls"); ob_get_clean(); header("Pragma: no-cache"); header("Expires: 0"); print "$header\n$result"; ?>