tFPDF - 在标题中显示 mySQL 结果

问题描述

我试图在 tFPDF 的标题中显示 MysqL 的结果。到目前为止，我已经设法创建了 pdf，但是当我尝试添加要显示的 sql 数据时，出现错误。

我的代码：

...
$count = "SELECT
             SUM(app_price_out) AS Outcome,SUM(app_price_in) AS Income,SUM(app_price) AS Turnover
          FROM tblappointment";

foreach($connection->query($count) as $row) {
    $Outcome= $row['Outcome'];
    $Income= $row['Income'];
    $Turnover= $row['Turnover'];
}

$Total = $Income - $Outcome;
$Debt =  $Turnover - $Income;

class PDF extends tFPDF
{
// Page header
function Header()
{
   $this->SetLeftMargin(9);
   $this->AddFont('Calibri','','Calibri.ttf',true);
   $this->SetFont('Calibri',9);
   $this->Cell(236,12,'Expenses',0);
   $this->Cell(18,6,'Total:','R');
   $this->Cell(25,number_format($Total,","."),'R');   ===> Error Line at $Total
   $this->Cell(18,'Debt:',number_format($Debt,'R');   ===> Error Line at $Debt
   $this->ln();
}
}
...

错误信息：

Notice: Undefined variable: Total in C:\xampp\...\page.PHP on line xx

解决方法

在 CBroe 的帮助下，这是我问题的解决方案。使用 global。

代码：

...
function Header()
{
   global $Total,$Debt;  
   $this->SetLeftMargin(9);
   ...