PHPExcel输出到浏览器不起作用

Question

I am not really a PHP expert as my past experience is mostly geared towards the system engineering side. I am facing a problem with PHPExcel which gives me this error "Cannot modify header information - headers already sent by in line 1" when I want to output my XLSX file to the browser.

Here is the sample of my code

$host="localhost";
$uname="lol";
$pass="lol123";
$database = "lol12345"; 
$table="MemReport";
$table1="CPUReport";
$table2="TrafficReport";
$table3="HDDReport";


// create a file pointer connected to the output stream
$output = fopen('Memory.csv', 'w+');
$output1 = fopen('CPU.csv', 'w+');
$output2 = fopen('Traffic.csv', 'w+');
$output3 = fopen('HDD.csv', 'w+');

// output the column headings
fputcsv($output, array('HostName','Date','Time','Percent','TholdDescription'));
fputcsv($output1, array('HostName','Date','Time','Percent','TholdDescription'));
fputcsv($output2, array('HostName','Date','Time','Percent','TholdDescription'));
fputcsv($output3, array('HostName','Date','Time','Percent','TholdDescription'));

// fetch the data
mysql_connect($host, $uname, $pass);
mysql_select_db($database);
echo mysql_error(); 

$rows = mysql_query("SELECT * FROM $table order by date ASC, Time ASC");
echo mysql_error(); 
$rows1 = mysql_query("SELECT * FROM $table1 order by date ASC, Time ASC");
echo mysql_error(); 
$rows2 = mysql_query("SELECT * FROM $table2 order by date ASC, Time ASC");
echo mysql_error();
$rows3 = mysql_query("SELECT * FROM $table3 order by date ASC, Time ASC");
echo mysql_error(); 
// loop over the rows, outputting them
while ($row = mysql_fetch_assoc($rows)) 
fputcsv($output, $row);
while ($row1 = mysql_fetch_assoc($rows1))   
fputcsv($output1, $row1);
while ($row2 = mysql_fetch_assoc($rows2))
fputcsv($output2, $row2);
while ($row3 = mysql_fetch_assoc($rows3))
fputcsv($output3, $row3);


include '/tmp/Classes/PHPExcel/IOFactory.php';


$inputFileType = 'CSV';
$inputFileNames = array('HDD.csv','Traffic.csv','CPU.csv','Memory.csv');
$objReader = PHPExcel_IOFactory::createReader($inputFileType);
$inputFileName = array_shift($inputFileNames);
$objPHPExcel = $objReader->load($inputFileName);

$objPHPExcel->getActiveSheet()->setTitle(pathinfo($inputFileName,PATHINFO_BASENAME));
foreach($inputFileNames as $sheet => $inputFileName) {
    $objReader->setSheetIndex($sheet+1);
    $objReader->loadIntoExisting($inputFileName,$objPHPExcel);
    $objReader->loadIntoExisting($inputFileName,$objPHPExcel);
    $objPHPExcel->getActiveSheet()->setTitle(pathinfo($inputFileName,PATHINFO_BASENAME));

}

$loadedSheetNames = $objPHPExcel->getSheetNames();
foreach($loadedSheetNames as $sheetIndex => $loadedSheetName) {
$objPHPExcel->setActiveSheetIndexByName($loadedSheetName);

$sheetData = $objPHPExcel->getActiveSheet()->toArray(null,true,true,true);
//var_dump($sheetData);
//var_dump($sheetData);

$myfile = "Report.xlsx";
header('Content-Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet');

header("Content-Disposition: attachment;filename=$myfile"); header('Cache-Control: max-age=0');

$objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel2007');
$objWriter->save('php://output');


}

any help is appreciated, most of my code has been copy and pasted and then edited to my knowledge, also i was able to get to email the xlsx file but just have problem sending it for download. I don't mind reading the file from the directory for download.

regards,

Lin

Answer 1

No spaces or tabs, no error messages, no newline characters, no BOM markers, no other output whatsoever.

Note that the error message you're seeing tells you which file/line was responsible for the output headers already sent by xxx in line 1 .... so that's where to look.

At line 1 of a file, it's most likely to be something before your opening <?php tag, or a file saved with a BOM header