PHP Library to merge PDF files
Add this line of code to composer.json
"peytwik/pdf-merger": "1.0.0"
//include autoloading
include "vendor/autoload.php";
//initiate class
$merger = new \Peytwik\PDFMerger\PDFMerger;
//add directory where the files are located
$dir = $_SERVER['DOCUMENT_ROOT'] . "/";
//add the pdf files
$merger->AddFile($dir . 'pdf-sample.pdf');
$merger->AddFile($dir . 'sample.pdf');
//generate the file
$output = $merger->GenerateFile($dir . 'merged.pdf');