php - 将 MySQL 数据导出到 Excel 会出错

Question

在使用 PHP 将数据导出到 excel 时，它被导出，但我不断收到这些错误消息:

1. “'database.xls' 的文件格式和扩展名不匹配。文件可能已损坏或不安全。除非您相信其来源，否则请勿打开它。您是否仍要打开它？”<
2. “Excel 已检测到‘database.xls’是 SYLK 文件，但无法加载它。文件有错误或不是 SYLK 文件格式。单击“确定”以尝试以其他格式打开。”

点击确定几次后，它确实打开了，但我想知道是否有一种简单的方法可以解决这个问题。

这是代码(使用 John Peter 的 code ):

<?php
    //db connection data  
    //create MySQL connection   
    $sql = "Select * from $DB_TBLName";
    $Connect = @mysql_connect($DB_Server, $DB_Username, $DB_Password) or die("Couldn't connect to       MySQL:<br>" . mysql_error() . "<br>" . mysql_errno());
    //select database   
    $Db = @mysql_select_db($DB_DBName, $Connect) or die("Couldn't select database:<br>" .     mysql_error(). "<br>" . mysql_errno());   
    //execute query 
    $result = @mysql_query($sql,$Connect) or die("Couldn't execute query:<br>" . mysql_error(). "    <br>" . mysql_errno());    
    $file_ending = "xls";
    //header info for browser
    header("Content-Type: application/xls");    
    header("Content-Disposition: attachment; filename=$filename.xls");  
    header("Pragma: no-cache"); 
    header("Expires: 0");
    /*******Start of Formatting for Excel*******/   
    //define separator (defines columns in excel & tabs in word)
    $sep = "\t"; //tabbed character
    //start of printing column names as names of MySQL fields
    for ($i = 0; $i < mysql_num_fields($result); $i++) {
        echo mysql_field_name($result,$i) . "\t";
    }
    print("\n");    
    //end of printing column names  
    //start while loop to get data
    while($row = mysql_fetch_row($result))
    {
        $schema_insert = "";
        for($j=0; $j<mysql_num_fields($result);$j++)
        {
            if(!isset($row[$j]))
                $schema_insert .= "NULL".$sep;
            elseif ($row[$j] != "")
                $schema_insert .= "$row[$j]".$sep;
            else
                $schema_insert .= "".$sep;
        }
        $schema_insert = str_replace($sep."$", "", $schema_insert);
        $schema_insert = preg_replace("/\r\n|\n\r|\n|\r/", " ", $schema_insert);
        $schema_insert .= "\t";
        print(trim($schema_insert));
        print "\n";
    }   
?>

Answer 1

这些错误与用于创建文件的编程语言无关。这两个错误都是由 MS Excel 中的一个错误引起的。
MSDN:

When you try to open a text or comma separated variable (CSV) file, you receive the following error message:

SYLK: File format is not valid

This problem occurs when you open a text or CSV file and the first two characters of the file are the letters ID (uppercase).

有关完整详细信息，请参阅 https://support.microsoft.com/en-in/help/215591/-sylk-file-format-is-not-valid-error-message-when-you-open-a-file-in-e