在为只适合第一页的数据创建PDF时，这段代码工作得很好。然而，在进入第二页时，一切都混乱了，并且不能创建适当的pdf。甚至第一页的数据也杂乱无章。
谁来帮我整理一下，这样任何数据从第二页导致适当的pdf。谢谢你！
<?php
ob_start();
require('fpdf/fpdf.php');
//database connection
//Select the Products you want to show in your PDF file
$result= mysqli_query($conn, "SELECT * FROM customer");
$number_of_products = mysqli_num_rows($result);
//Initialize the columns and the total
$column_id = "";
$column_name = "";
$column_trans_id = "";
//For each row, add the field to the corresponding column
while($row = mysqli_fetch_array($result))
{
$id = $row["id"];
$name = $row["name"];
$trans_id = substr($row["trans_id"],0,20);
$column_id = $column_id.$id."'n";
$column_name = $column_name.$name."'n";
$column_trans_id = $column_trans_id.$trans_id."'n";
}
mysqli_close();
//Create a new PDF file
$pdf=new FPDF();
$pdf->AddPage();
//Fields Name position
$Y_Fields_Name_position = 20;
//Table position, under Fields Name
$Y_Table_Position = 26;
//First create each Field Name
//Gray color filling each Field Name box
$pdf->SetFillColor(232,232,232);
//Bold Font for Field Name
$pdf->SetFont('Arial','B',8);
$pdf->SetY($Y_Fields_Name_position);
$pdf->SetX(0);
$pdf->Cell(10,6,'ID',1,0,'L',1);
$pdf->SetX(10);
$pdf->Cell(30,6,'NAME',1,0,'L',1);
$pdf->SetX(40);
$pdf->Cell(20,6,'TRASACTION ID',1,0,'L',1);
$pdf->SetX(60);
$pdf->Ln();
//Now show the columns
$pdf->SetFont('Arial','',8);
$pdf->SetY($Y_Table_Position);
$pdf->SetX(0);
$pdf->MultiCell(10,6,$column_id,1);
$pdf->SetY($Y_Table_Position);
$pdf->SetX(10);
$pdf->MultiCell(30,6,$column_name,1);
$pdf->SetY($Y_Table_Position);
$pdf->SetX(40);
$pdf->MultiCell(20,6,$column_trans_id,1);
$pdf->SetY($Y_Table_Position);
$pdf->SetX(60);
//Create lines (boxes) for each ROW (Product)
//If you don't use the following code, you don't create the lines separating each row
$i = 0;
$pdf->SetY($Y_Table_Position);
while ($i < $number_of_products)
{
$pdf->SetX(0);
$pdf->MultiCell(60,6,'',1);
$i = $i +1;
}
ob_end_clean();
$pdf->Output();
ob_end_flush();
?>
代码的问题是，您将数据库中的所有结果行放入多行字符串中，并且每列只创建一个单元格，这很糟糕。单元格可以扩展到一个以上的页面。添加单元格时，它将在前一个单元格扩展到的页面上开始。虽然可以返回到表开始的页面，但这不是在FPDF中输出表的首选方式。
更常见的方法是为从数据库获得的每个结果行添加一组单元格。这节省了绘制单元格边界的第二次迭代，以及大量的重新定位。
<?php
require('fpdf/fpdf.php');
// Connect to database...
// Define your columns like so:
$columns = array(array("name" => "id", "width" => 10),
array("name" => "name", "width" => 30),
array("name" => "transaction_id", "width" => 20));
$pdf = new FPDF();
$pdf->AddPage();
// Table header
$pdf->SetFillColor(232, 232, 232);
$pdf->SetFont('Arial', 'B', 8);
foreach ($columns as $column)
{
$pdf->Cell($column['width'], 6, strtoupper($column['name']), 1, 0, 'L', 1);
}
$pdf->Ln();
// Table rows
$pdf->SetFont('Arial', '', 8);
$result = mysqli_query($conn, "SELECT id, name, transaction_id FROM customers");
while ($row = mysqli_fetch_assoc($result))
{
foreach ($columns as $column)
{
$pdf->Cell($column['width'], 6, $row[$column['name']], 1);
}
$pdf->Ln();
}
// Clean up
mysqli_free_result($result);
mysqli_close($conn);
$pdf->Output();