Convert uploaded file with php -

i want convert .bib files html using php script (http://www.monperrus.net/martin/bibtexbrowser/)

i have form

<form action="upload.php" method="post" enctype="multipart/form-data">     <input type="file" name="file1"> </form> 

the upload.php:

<?php     $_get['library']=1;     define('bibtexbrowser_bibtex_links',false); // no [bibtex] link default     require_once('bibtexbrowser.php');     global $db;     $db = new bibdatabase();     // $db->load('uploads/ref.bib');     $db->load("uploads/". $file_name);      // printing 2014 entries     // can $query = array('year'=>'.*');     $query = array('year'=>'2014');     $entries=$db->multisearch($query);     uasort($entries, 'compare_bib_entries');      foreach ($entries $bibentry) {         echo $bibentry->tohtml()."<br/>";     } ?> 

in other form want convert upload file:

<form method="post" action="convert.php">     <input type="submit" value="convert" class="submit"> </form> 

convert.php:

<?php     $_get['library']=1;     define('bibtexbrowser_bibtex_links',false); // no [bibtex] link default     require_once('bibtexbrowser.php');     global $db;     $db = new bibdatabase();     // $db->load('uploads/ref.bib');     $db->load("uploads/". $file_name);      // printing 2014 entries     // can $query = array('year'=>'.*');     $query = array('year'=>'2014');     $entries=$db->multisearch($query);     uasort($entries, 'compare_bib_entries');       foreach ($entries $bibentry) {          echo $bibentry->tohtml()."<br/>";      } ?> 

if uncomment $db->load('uploads/ref.bib'); work. want filename first form.

where mistake?

here trying: https://novelettish-ballast.000webhostapp.com/