使用FPDF致命错误：有些数据已经输出，无法发送PDF文件？

当我试图创建PDF文件时我收到以下错误？
我不知道为什么，我不知道如何解决它？错误是类似于下面
`使用FPDF致命错误：有些数据已经输出，无法发送PDF文件？

Warning: Cannot modify header information - headers already sent by (output started at C:\xampp\htdocs\phpexample\createpdf.php:1) in C:\xampp\htdocs\phpexample\fpdf16\fpdf.php on line 1017`<br/> 
`FPDF error: Some data has already been output, can't send PDF file`<br/>

我的编码是这样

<?php 
include_once('fpdf16/fpdf.php');$pdf=new FPDF(); 

$pdf->AddPage(); 
$reportdate = date('d-m-Y H:i:s'); 
$filename = $reportdate.'_report.pdf'; 
$pdf->SetFillColor(255,0,0); 
$pdf->SetTextColor(255); 
$pdf->SetDrawColor(128,0,0); 
$pdf->SetLineWidth(.3); 
$pdf->SetFont('Arial', 'B', 6); 
// Header 
$header=array('Member Card No','Full Name','Description', 'Start Date', 'Expiry Date', 'ramount', 'Address1', 'Address2'); 
$w = array(25, 35, 35, 15, 18, 15, 30, 30); 
for($i=0;$i<count($header); $i++) 
     $pdf->Cell($w[$i],7, $header[$i], 1, 0, 'L', true); 

$pdf->Ln(); 

// Reset colour set for data 
$pdf->SetFillColor(224,235,255); 
$pdf->SetTextColor(0); 
$pdf->SetFont('courier','',7); 
$fill=false; 
$resultcount=8; 
for($i=0;$i<$resultcount;$i++) 
{ 
     $height =6; 
     $pdf->Cell($w[0], '$height', 'CardNoishai', '1', '0', 'L', $fill); 
     $pdf->Cell($w[1], '$height', 'Vinoth', '1', '0', 'L', $fill); 
     $pdf->Cell($w[2], '$height', 'Sample PDF', '1', '0', 'L', $fill); 
     $pdf->Cell($w[3], '$height', date('m-d-y'), '1', '0', 'L', $fill); 
     $pdf->Cell($w[4], '$height', date('m-d-y'), '1', '0', 'L', $fill); 
     $pdf->Cell($w[5], '$height', 'test', '1', '0', 'L', $fill); 
     $pdf->Cell($w[5], '$height', 'test', '1', '0', 'L', $fill); 
     $pdf->Cell($w[5], '$height', 'Add2', '1', '0', 'L', $fill); 
     $pdf->Ln(); 
     $fill = !$fill; 

}  
$pdf->Cell(array_sum($w),0,'','T'); 
$pdf->Output($filename, 'I'); 
?>

来源

2010-08-20 svk

也许你也许必须从utf-8改为ansi – AboSami 2011-12-22 13:00:29