Question

我只是根据存储在mysql表中的数据生成一个csv文件。生成的csv在excel中打开时似乎大部分没问题，但只要它有换行符，excel就会将数据放在新行上。知道怎么预防吗？

示例数据

line 1 some data
another data

CSV生成代码：

header("Content-Type: text/csv; charset=UTF-8");
header("Content-Disposition: attachment; filename=\"".$MyFileName."\"");
$filename = $MyFileName;
$handle = fopen("temp_files/".$filename, "r");
$contents = fread($handle, filesize("temp_files/".$filename));
fclose($handle);
echo $contents;  
exit;

我曾经摆脱新行的内容片段（不起作用）：

$pack_inst = str_replace(',',' ',$get_data->fields['pack_instruction']);
        $pack_inst = str_replace('\n',' ',$pack_inst);
        $pack_inst = str_replace('\r',' ',$pack_inst);
        $pack_inst = str_replace('\r\n',' ',$pack_inst);
        $pack_inst = str_replace('<br>',' ',$pack_inst);
        $pack_inst = str_replace('<br/>',' ',$pack_inst);
        $pack_inst = str_replace(PHP_EOL, '', $pack_inst);
        $pattern = '(?:[ \t\n\r\x0B\x00\x{A0}\x{AD}\x{2000}-\x{200F}\x{201F}\x{202F}\x{3000}\x{FEFF}]|&nbsp;|<br\s*\/?>)+';
        $pack_inst = preg_replace('/^' . $pattern . '|' . $pattern . '$/u', ' ', $pack_inst);
        $content .=','.$pack_inst;

Answer 1

根据RFC 4180，如果列的内容包含行分隔符（\r\n），列分隔符（,）或字符串分隔符（"），那么您必须将内容括在双引号"中。执行此操作时，您必须通过在其中添加另一个"来转义内容中的所有"个字符。以下是CSV内容：

1: OK,2: this "might" work but not recommended,"3: new
line","4: comma, and text","5: new
line and ""double"" double quotes"
1: Line 2

将生成2行CSV数据，第一行包含5列。

话虽如此，请查看fputcsv()函数。它将为您处理大多数血腥的细节。

Answer 2

您展示的不是CSV 代代码，它只是您用来强制下载到浏览器的代码。无论如何，您需要对此进行排序的函数是fputcsv()，它会自动考虑您编写的任何代码以将表格数据转换为CSV格式的各种边缘情况。

你说这是基于MySQL表中的数据，这是一个创建CSV文件的基本框架，假设MySQLi扩展以程序方式使用：

<?php

  // Connect to database and generate file name here
  $fileName = 'file.csv';

  // Get the data from the database
  $query = "
    SELECT *
    FROM table_name
    WHERE some_column = 'Some Value'
    ORDER BY column_name
  ";
  if (!$result = mysqli_query($db, $query)) {
    // The query failed
    // You may want to handle this with a more meaningful error message
    header('HTTP/1.1 500 Internal Server Error');
    exit;
  } else if (!mysqli_num_rows($result)) {
    // The query returned no results
    // You may want to handle this with a more meaningful error message
    header('HTTP/1.1 404 Not Found');
    exit;
  }

  // Create a temporary file pointer for storing the CSV file
  $tmpFP = fopen('php://temp', 'w+');

  // We'll keep track of how much data we write to the file
  $fileLength = 0;

  // Create a column head row and write first row to file
  $firstRow = mysqli_fetch_assoc($result);
  $fileLength += fputcsv($tmpFP, array_keys($firstRow));
  $fileLength += fputcsv($tmpFP, array_values($firstRow));

  // Write the rest of the rows to the file
  while ($row = mysqli_fetch_row($result)) {
    $fileLength += fputcsv($tmpFP, $row);
  }

  // Send the download headers
  header('Content-Type: text/csv; charset=UTF-8');
  header('Content-Disposition: attachment; filename="'.$fileName.'"');
  header('Content-Length: '.$fileLength);

  // Free some unnecessary memory we are using
  // The data might take a while to transfer to the client
  mysqli_free_result($result);
  unset($query, $result, $firstRow, $row, $fileName, $fileLength);

  // Prevent timeouts on slow networks/large files
  set_time_limit(0);

  // Place the file pointer back at the beginning
  rewind(tmpFP);

  // Serve the file download
  fpassthru($tmpFP);

  // Close the file pointer
  fclose($tmpFP);

  // ...and we're done
  exit;

在php中使用换行符生成csv时出现小故障

2 个答案: