How to convert Html to PDF using DOMPDF library?

<?php
if (!defined('BASEPATH')) exit('No direct script access allowed');

require_once 'dompdf/autoload.inc.php';

use Dompdf\Dompdf;

class Pdf extends Dompdf
{
public function __construct()
{
parent::__construct();
}
}

?>

<?php
defined('BASEPATH') OR exit('no direct script access allowed');
class Members extends CI_Controller
{
public function __construct()
{
parent::__construct();
$this->load->model('Admin_basic_model');
$this->load->library('pdf');
}

public function all_member()
{
$data = array();
$title['title'] = "All Member List";
$result_member = $this->Admin_basic_model->get_all_members();
$data['memberlist'] = $result_member;

$this->load->view('admin/basic/header',$title);
$this->load->view('admin/basic/allmemberlist',$data);
$this->load->view('admin/basic/footer');
}


public function pdfdetails($user_id)
{

//if($this->uri->segment(3))
//{
//$user_id = $this->uri->segment(3);

$html_content = '<h3 align="center">Convert HTML to PDF in CodeIgniter using Dompdf</h3>';
$html_content .= $this->Admin_basic_model->fetch_single_details($user_id);
$this->pdf->loadHtml($html_content);
$this->pdf->setPaper('A4', 'landscape');
$this->pdf->render();
$this->pdf->stream("".$user_id.".pdf", array("Attachment"=>0));

//}
}

public function pdfconvert()
{
$html_content = '<h3 align="center">Convert HTML to PDF in CodeIgniter using Dompdf</h3>';
$html_content .= $this->Admin_basic_model->fetch_alluser_details();
$this->pdf->loadHtml($html_content);
$this->pdf->render();
$this->pdf->stream("userdetail".".pdf", array("Attachment"=>0));
}






}

<div class="row">
<div class="col-12">
<div class="card-box table-responsive">
<h4 class="m-t-0 header-title"> </h4>

<a href="<?php echo base_url()?>admin/basic/members/pdfconvert">Download PDF</a>

<table id="datatable" class="table table-bordered">
<thead>
<tr>
<th>U-Id</th>
<th>Name</th>
<th>Sp-Id</th>
<th>Sp-Name</th>
<th>position</th>
<th>Member</th>
<th>Mobile</th>
<th>R-date</th>
<th>Status</th>
<th>Action</th>
</tr>
</thead>


<tbody>
<?php
if(!empty($memberlist))
{
foreach ($memberlist as $row){
?>
<tr>
<td><a href="<?php echo base_url()?>admin/basic/members/show_down_members/<?php echo $row->user_id;?>"><?php echo $row->user_id;?></a></td>
<td><?php echo $row->name;?></td>
<td><?php echo $row->sponser_code;?></td>
<td><?php echo $row->sponser_name;?></td>
<td><?php echo $row->user_position;?></td>
<td><?php echo $row->user_child;?></td>
<td><?php echo $row->mobile;?></td>
<td><?php echo $row->registration_date;?></td>
<td>

<?php if($row->status==1){?>

<button class="btn btn-icon waves-effect waves-light btn-success m-b-5"> <span>Yes</span> </button>

<?php } else { ?>

<button class="btn btn-icon waves-effect waves-light btn-danger m-b-5"> <i class="fa fa-remove"></i> </button>

<?php } ?>





</td>

<td>

<div class="btn-group">
<button type="button" class="btn btn-secondary dropdown-toggle waves-effect waves-light" data-toggle="dropdown" aria-expanded="false">Action <span class="caret"></span></button>
<div class="dropdown-menu">

<a class="dropdown-item" href="<?php echo base_url()?>admin/profile/profile_details/<?php echo $row->user_id;?>">Edit</a>
<a class="dropdown-item viewbtn" href="javascript:void();" id="<?php echo $row->user_id; ?>" >View</a>
<a class="dropdown-item" href="<?php echo base_url()?>admin/basic/members/pdfdetails/<?php echo $row->user_id?>">View PDF</a>
</div>
</div>

</td>

</tr>
<?php } }else{ ?>

<tr>
<td>----- Recored Not Found -----</td>

</tr>

<?php }?>

</tbody>
</table>
</div>
</div>
</div> <!-- end row -->

function fetch_single_details($user_id)
{
$this->db->where('user_id', $user_id);
$data = $this->db->get('user_register');
$output = '<table width="100%" cellspacing="5" cellpadding="5">';
foreach($data->result() as $row)
{
$output .= '
<tr>
<td width="25%"><img src="'.base_url().'images/'.$row->profile_photo.'" /></td>
<td width="75%">
<p><b>Name : </b>'.$row->user_id.'</p>
<p><b>Address : </b>'.$row->name.'</p>
<p><b>City : </b>'.$row->user_position.'</p>
<p><b>Postal Code : </b>'.$row->sponser_code.'</p>
<p><b>Country : </b> '.$row->mobile.' </p>
</td>
</tr>
';
}
$output .= '
<tr>
<td colspan="2" align="center"><a href="'.base_url().'admin/basic/members/all_member" class="btn btn-primary">Back</a></td>
</tr>
';
$output .= '</table>';
return $output;
}


public function fetch_alluser_details()
{
$this->db->select('*');
$this->db->from('user_register');
$this->db->where('status', '1');
$data = $this->db->get();
$output = '<table width="100%" cellspacing="5" cellpadding="5">';
foreach($data->result() as $row)
{
$output .= '
<tr>
<td>'.$row->user_id.' </td>
<td> '.$row->name.'</td>
<td> '.$row->user_position.'</td>
<td> '.$row->sponser_code.'</td>
<td> '.$row->mobile.'</td>

</tr>
';
}
$output .= '
<tr>
<td colspan="2" align="center"><a href="'.base_url().'admin/basic/members/all_member" class="btn btn-primary">Back</a></td>
</tr>
';
$output .= '</table>';
return $output;
}

The following are some useful methods of Dompdf library to implement HTML to PDF conversion functionality.

loadHtml(): Loads HTML content.
$str (string) – Required. Specify the HTML to load.
$encoding (string) – Optional. Specify encoding.
loadHtmlFile(): Loads content from an HTML file.
$file (string) – Required. Specify file path to load.
output(): Returns the PDF as a string.
$options (array) – Optional. Specify whether content stream compression will enable. (compress => 1 or 0)
render(): Renders the HTML to PDF.
setBasePath(): Sets the base path to include external stylesheets and images.
$basePath (string) – The base path to be used when loading the external resources URLs.
setPaper(): Sets the paper size & orientation.
$size (string|array) – ‘letter’, ‘legal’, ‘A4’, etc.
$orientation (string) – ‘portrait’ or ‘landscape’.
stream(): Streams the PDF to the client.
$filename (string) – Specify name of the file (without .pdf extension).
$options (array) –
‘compress’ => 1 or 0 – enable content stream compression.
‘Attachment’ => 1 = download or 0 = preview

<?php defined('BASEPATH') OR exit('No direct script access allowed');

class Welcome extends CI_Controller {

public function index(){
$this->load->view('welcome_message');

// Get output html
$html = $this->output->get_output();

// Load pdf library
$this->load->library('pdf');

// Load HTML content
$this->dompdf->loadHtml($html);

// (Optional) Setup the paper size and orientation
$this->dompdf->setPaper('A4', 'landscape');

// Render the HTML as PDF
$this->dompdf->render();

// Output the generated PDF (1 = download and 0 = preview)
$this->dompdf->stream("welcome.pdf", array("Attachment"=>0));
}

}

<?php defined('BASEPATH') OR exit('No direct script access allowed');
use Dompdf\Dompdf;
class Pdf
{
public function __construct(){

// include autoloader
require_once dirname(__FILE__).'/dompdf/autoload.inc.php';

// instantiate and use the dompdf class
$pdf = new DOMPDF();

$CI =& get_instance();
$CI->dompdf = $pdf;

}
}
?>