如何在PHP中从MySQL导出希腊字符到Excel

Question

我在MySQL中有上述数据，我正在尝试使用以下方法将它们导出到Excel：

$Connect = @mysql_connect($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());   

//iso-8859-7

mysql_query("SET NAMES 'iso-8859-7'", $Connect);
mysql_query("SET CHARACTER SET 'iso-8859-7'", $Connect);

//execute query 
$sql = "Select * from $DB_TBLName";
$result = @mysql_query($sql,$Connect) or die("Couldn't execute query:<br>" . mysql_error(). "<br>" . mysql_errno());    

$file_ending = "xls";
//header info for browser
//header("Content-Type: application/xls; charset=utf-8");  
header("Content-Type: application/vnd.ms-excel;charset=iso-8859-7");  
header("Content-Encoding: iso-8859-7");  
//header("Content-Disposition: attachment; filename=$filename.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";
    }

所有希腊字符都显得像??????导出到Excel时。我尝试了几种方法，但它们没有用。

欢迎任何答案