Question

我得到的错误信息是标题。我正在使用mysqli_我在空白页面上使用了mysql_来测试它。当我把它放到我真实页面上的点击时它告诉我我不能使用mySql_，因为它已经老了所以将它转换为mySqli_。我现在得到的错误信息是：

＆＃34;警告：无法修改标头信息 - 已发送的标头（输出从/xx/xxx/xxx.php:183开始）/xxx/xxx/xxx.php在线 232警告：无法修改标头信息 - 已发送的标头在/xxx/xxx/xxx.php上的（输出从/xxx/xxx/xxx.php:183开始）第233行致命错误：调用未定义的函数outputcsv（）in /xxx/xxx/xxx.php在第237行＆＃34;

require_once 'dbconfig.php';

$conn = new mysqli("xxxx", "xxxx", $password, $dbname);//host, user, password, database

$result = $conn->query('SELECT * FROM reports') or die(mysqli_error());

//these two lines are the lines 232 and 233
header('Content-Type: text/csv'); // tell the browser to treat file as CSV
header('Content-Disposition: attachment;filename=report.csv'); // tell browser to download a file in user's system with name export.csv

$row = mysqli_fetch_assoc($result); // Get the column names
if ($row) {
    outputcsv(array_keys($row)); // It wil pass column names to outputcsv function
}

//this line here is 237
while ($row) {
    outputcsv($row);    // loop is used to fetch all the rows from table and pass them to outputcsv func
    $row = mysqli_fetch_assoc($result);
 }

 function outputcsv($fields) {
   $csv = '';
    foreach ($fields as $field) {
        $csv .= '"' . $field . '",';
    }
    $csv .= "\r\n";     //Give a carriage return and new line space after each record
    echo $csv;
}

Answer 1

您需要在配置文件中设置输出缓冲区

或

只需在代码的第一行写下ob_start（）..

我还建议以xls格式导出以获得更好的兼容性。

Answer 2

您需要查找php output buffering。

您正在第183行headers already sent by (output started at /xx/xxx/xxx.php:183)上回显或发送某种数据，然后修改标题。您可以使用OB缓冲要发送到浏览器的信息，修改标题然后刷新缓冲区。

ob_start();
require_once 'dbconfig.php';

$conn = new mysqli("xxxx", "xxxx", $password, $dbname);//host, user, password, database

$result = $conn->query('SELECT * FROM reports') or die(mysqli_error());

//these two lines are the lines 232 and 233
header('Content-Type: text/csv'); // tell the browser to treat file as CSV
header('Content-Disposition: attachment;filename=report.csv'); // tell browser to download a file in user's system with name export.csv

$row = mysqli_fetch_assoc($result); // Get the column names
if ($row) {
    outputcsv(array_keys($row)); // It wil pass column names to outputcsv function
}

//this line here is 237
while ($row) {
    outputcsv($row);    // loop is used to fetch all the rows from table and pass them to outputcsv func
    $row = mysqli_fetch_assoc($result);
 }

 function outputcsv($fields) {
   $csv = '';
    foreach ($fields as $field) {
        $csv .= '"' . $field . '",';
    }
    $csv .= "\r\n";     //Give a carriage return and new line space after each record
    echo $csv;
}
ob_flush();

您还可以使用ob_get_flush()或ob_get_contents()将缓冲区的内容返回给字符串，允许从函数等返回。注意：ob_get_contents()不清除缓冲区它只是在那时返回内容。

我还看到有关outputcsv（$ fields）未定义的错误，但是在解释器可以通过标题问题后可能会清除。

php导出MySql到excel表不会工作

2 个答案: