FPDF将MySql导出为PDF

I have this error fetching MySql table to PDF using FPDF.

It shows only 3 columns in portrait format where I am passing general query which should display all the columns.

I need an expert advice that how to resolve this.

My code is:

    <?php
    require_once("dbcontroller.php");
    $db_handle = new DBController();
    $result = $db_handle->runQuery("SELECT * FROM icard");
    $header = $db_handle->runQuery("SELECT `COLUMN_NAME` FROM       
    `INFORMATION_SCHEMA`.`COLUMNS` WHERE `TABLE_SCHEMA`='blog_samples' AND  
    `TABLE_NAME`='icard'");

    require('fpdf/fpdf.php');
    $pdf = new FPDF();
    $pdf->AddPage();
    $pdf->SetFont('Arial','B',12);      
    foreach($header as $heading) {
    foreach($heading as $column_heading)
    $pdf->Cell(90,12,$column_heading,1);
    }
    foreach($result as $row) {
    $pdf->SetFont('Arial','',12);   
    $pdf->Ln();
    foreach($row as $column)
    $pdf->Cell(90,12,$column,1);
    }
    $pdf->Output();
    ?>

When I am running this script, it only fetches 3 columns. I have 10 columns which need to be fetched - how can I do it?

If you have any idea then help me