PHP/MySQL使用管道分隔符获取并转换为csv

我有一个PHP脚本，它将mysql查询导出到一个|分隔的文件。除了最后一个“专栏”之外，这个功能非常好，在我不需要的时候添加了一个|管道

$values = mysql_query("SELECT ColumnA AS Name, ColumnB AS Address, ColumnC AS Phone FROM Table1");
$row = 0;
while ($rowr = mysql_fetch_assoc($values)) 
{
  if ($row == 0)
  $row++;
  $csv_output .= "id|";
  foreach($rowr as $name => $value)
  {
  $csv_output .= $value."|";
  }   
      $csv_output .= "\n";    
}

最终结果看起来像

Name|Address|Phone|
Name|Address|Phone|
Name|Address|Phone|

我如何避免在手机后面有末端管道|因此它看起来像这样：

Name|Address|Phone
Name|Address|Phone
Name|Address|Phone

用这个

while ($rowr = mysql_fetch_assoc($values)) 
{
  if ($row == 0)
  $row++;
  $csv_output .= "id|";
  foreach($rowr as $name => $value)
  {
  $csv_output .= $value."|";
  }   
      $csv_output = substr($csv_output,0,-1);
      $csv_output .= "\n";    
}

用这个

while ($rowr = mysql_fetch_assoc($values)) 
{
  if ($row == 0)
  $row++;
  $csv_output .= "id|";
  foreach($rowr as $name => $value)
  {
  $csv_output .= $value."|";
  }   
      $csv_output = substr($csv_output,0,-1);
      $csv_output .= "\n";    
}