merge 2 pdf in php

1<?php 
2    use setasign\Fpdi\Fpdi;
3
4    require_once('fpdf/fpdf.php');
5    require_once('FPDI/src/autoload.php');
6
7    $files = ['pd1.pdf', 'resume-converted.pdf'];
8
9    $pdf = new FPDI();
10
11    // iterate over array of files and merge
12    foreach ($files as $file) {
13        $pageCount = $pdf->setSourceFile($file);
14        for ($i = 0; $i < $pageCount; $i++) {
15            $tpl = $pdf->importPage($i + 1, '/MediaBox');
16            $pdf->addPage();
17            $pdf->useTemplate($tpl);
18        }
19    }
20
21    // output the pdf as a file (http://www.fpdf.org/en/doc/output.htm)
22    $pdf->Output('F','save_path/merged.pdf');
23?>

1<?php
2require('fpdf_merge.php');
3
4$merge = new FPDF_Merge();
5$merge->add('doc1.pdf');
6$merge->add('doc2.pdf');
7$merge->output();
8?>