>我正在尝试使用标题功能下载CSV文件，但由于某些原因，它无法在浏览器中下载。
错误是：
Warning: Cannot modify header information - headers already sent by (output started at /xxx/fruitapp/report-admin/common/header.php:156) in /xxx/fruitapp/report-admin/pages/createCSVdamage.php on line 434
我header.php file line 156哪个错误是指有错误
<div class="container-fluid">
<div class="row-fluid">
<?php if($title[0] != 'reports' && $title[0] != 'damage_reports' && $title[0] != 'Byconsignee_reports' && $title[0] != 'Byhold_reports' && $title[0] != 'general_reports'){?>
<div class="span3" id="sidebar">
<ul class="nav nav-list bs-docs-sidenav nav-collapse collapse">
<?php if($title[0]=='dashboard'){?>
<li class="active"><a href="index.php?select=dashboard"><i class="icon-chevron-right"></i>Dashboard</a></li>
<?php }if($title[0]=='report_entry' || $title[0]=='add_report_entry' || $title[0]=='edit_report_entry'){?>
<li><a href="index.php?select=report_entry"><i class="icon-chevron-right"></i>Manage Report Entry</a></li>
<li><a href="index.php?select=add_report_entry"><i class="icon-chevron-right"></i>Add Report Entry</a></li>
<?php }if($title[0]=='damage_entry' || $title[0]=='add_damage_entry' || $title[0]=='edit_damage_entry'){?>
<li><a href="index.php?select=damage_entry"><i class="icon-chevron-right"></i>Manage Damage Entry</a></li>
<li><a href="index.php?select=add_damage_entry"><i class="icon-chevron-right"></i>Add Damage Entry</a></li>
<?php }if($title[0]=='edit'){?>
<li><a href="index.php?select=edit"><i class="icon-chevron-right"></i>Manage Edit</a></li>
<?php }if($title[0]=='search'){?>
<li><a href="index.php?select=search"><i class="icon-chevron-right"></i>Manage Search</a></li>
<?php }if($title[0]=='users' || $title[0]=='add_user' || $title[0]=='edit_user'){?>
<li><a href="index.php?select=users"><i class="icon-chevron-right"></i>Manage User</a></li>
<li><a href="index.php?select=add_user"><i class="icon-chevron-right"></i>Add Users</a></li>
<?php }?>
</ul>
</div>
<?php }?>
学徒没有空白，甚至我也尝试使用 BOM，但没有任何效果。
此外，如果我添加ob_start();它只会在ftp上的文件充满数据时导出空文件。
我的文件末尾存在的代码是 - 我正在使用此代码在浏览器中下载它。
if ((isset($_REQUEST['date_from']) && $_REQUEST['date_from'] != "") || (isset($_REQUEST['date_to']) && $_REQUEST['date_to'] != "")) {
fputcsv($file, array(
'Report Number',
'Consignee',
'Pallet ID',
'Label/Mark',
'Fruit/Variety',
'Deck',
'Type',
'Damage Description',
'Pieces Damage',
'Category'
));
$sql = mysql_query("SELECT * FROM damage") or die('Error In Query');
while ($rows = mysql_fetch_object($sql)) {
$sqaal = mysql_query("SELECT
damage_entry.report_ID,
damage_entry.consignee,
damage_entry.pallet_ID,
damage_entry.label,
damage_entry.variety,
CONCAT(damage_entry.hold,damage_entry.deck),
damage_entry.type,
damage_entry.damage_desc,
damage_entry.pieces,
damage_entry.category_code
FROM
damage_entry
WHERE
damage='" . $rows->damage_name . "' " . $cond . "") or die(mysqli_error(self::get_Conn()));
$a = mysql_num_rows($sqaal);
if ($a > 0) {
fwrite($file, $rows->damage_name);
fwrite($file, "'r'n");
$valuesArray = array();
$as = 0;
$sd = array();
$gggg = array();
while ($row = mysql_fetch_assoc($sqaal)) {
$array = array(
$row['report_ID'],
$row['consignee'],
$row['pallet_ID'],
$row['label'],
$row['variety'],
$row['CONCAT(damage_entry.hold,damage_entry.deck)'],
$row['type'],
$row['damage_desc'],
$row['pieces'],
//$objadminViewFunctions->getCategoryLetter($row['category_code'])
);
array_push($sd, $row['pieces']);
array_push($gggg, $row['pallet_ID']);
fputcsv($file, $array);
}
fwrite($file, "'r'n");
fputcsv($file, array(
"",
"Sub Total",
count($gggg),
"",
"",
"",
"",
"",
array_sum($sd),
"",
""
));
fwrite($file, "'r'n");
}
}
} else {
fputcsv($file, array(
'Report Number',
'Consignee',
'Pallet ID',
'Label/Mark',
'Fruit/Variety',
'Deck',
'Type',
'Damage Description',
'Pieces Damage',
'Category'
));
$sql = mysql_query("SELECT * FROM damage") or die('Error In Query');
while ($rows = mysql_fetch_object($sql)) {
$sqaal = mysql_query("SELECT
damage_entry.de_ID,
damage_entry.report_ID,
damage_entry.consignee,
damage_entry.pallet_ID,
damage_entry.label,
damage_entry.variety,
CONCAT(damage_entry.hold,damage_entry.deck),
damage_entry.type,
damage_entry.damage_desc,
damage_entry.pieces,
damage_entry.category_code
FROM
damage_entry
WHERE
damage='" . $rows->damage_name . "'") or die(mysqli_error(self::get_Conn()));
$a = mysql_num_rows($sqaal);
if ($a > 0) {
fwrite($file, $rows->damage_name);
fwrite($file, "'r'n");
$valuesArray = array();
$as = 0;
$sd = array();
$gggg = array();
while ($row = mysql_fetch_assoc($sqaal)) {
$array = array(
$row['report_ID'],
$row['consignee'],
$row['pallet_ID'],
$row['label'],
$row['variety'],
$row['CONCAT(damage_entry.hold,damage_entry.deck)'],
$row['type'],
$row['damage_desc'],
$row['pieces'],
//$objadminViewFunctions->getCategoryLetter($row['category_code'])
);
array_push($sd, $row['pieces']);
array_push($gggg, $row['pallet_ID']);
fputcsv($file, $array);
}
fwrite($file, "'r'n");
fputcsv($file, array(
"",
"Sub Total",
count($gggg),
"",
"",
"",
"",
"",
array_sum($sd),
"",
""
));
fwrite($file, "'r'n");
}
}
}
fclose($file);
$filename = $FileName;
if(ini_get('zlib.output_compression'))
ini_set('zlib.output_compression', 'Off');
$file_extension = strtolower(substr(strrchr($filename,"."),1));
switch( $file_extension ){
case "pdf": $ctype="application/pdf"; break;
case "exe": $ctype="application/octet-stream"; break;
case "zip": $ctype="application/zip"; break;
case "doc": $ctype="application/msword"; break;
case "xls": $ctype="application/vnd.ms-excel"; break;
case "csv": $ctype="text/csv"; break;
case "ppt": $ctype="application/vnd.ms-powerpoint"; break;
case "gif": $ctype="image/gif"; break;
case "png": $ctype="image/png"; break;
case "jpeg":
case "jpg": $ctype="image/jpg"; break;
default: $ctype="application/force-download";
}
header("Content-Type: application/octet-stream");
header("Pragma: public");
header("Expires: 0");
header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
header("Cache-Control: private",false);
header("Content-Type: $ctype");
header("Content-Disposition: attachment; filename='"".basename($filename)."'";" );
header("Content-Transfer-Encoding: binary");
header("Content-Length: ".filesize($filename));
PS：我还使用十六进制编辑器来检查代码中的 BOM，但所有代码都干净且已清除。标头中没有任何输出，我的问题中也没有这种情况，因为它与函数之前的echo语句无关header。
我的问题是它没有在浏览器中下载。
您最初的问题是您以某种方式调用了 header.php ，其中包含一堆 html - 在标头之前不能将任何类型的输出发送到浏览器。解决方案是直接呼叫createCSVdamage.php。
关于空的 csv，您实际上从未将 csv 数据发送到 oputput 流。设置标头后，您可以通过读取文件函数执行此操作：
header("Content-Type: application/octet-stream");
header("Pragma: public");
header("Expires: 0");
header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
header("Cache-Control: private",false);
header("Content-Type: $ctype");
header("Content-Disposition: attachment; filename='"".basename($filename)."'";" );
header("Content-Transfer-Encoding: binary");
header("Content-Length: ".filesize($filename));
//send the data to the browser
readfile($filename);
要移动文件，您可以在发送数据后使用重命名和路径信息功能：
$fileData = pathinfo($filename);
$nameWithoutDirectory = $fileData['basename'];
rename($filename, 'some/directory/' . $nameWithoutDirectory);
或者首先在正确的目录中创建文件！