javascript - Multiple file upload and zip them on the fly failed -

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i have created multiple file uploader using html & php. uploader functionality works fine while try create zip on fly in order add uploaded file zip file. in case, failed create zip , add uploaded file zip. don't know why it's not working.

please check scripts below , let me know if missed in advance:

html scripts:

<!doctype html> <html lang="en"> <head>  <meta charset="utf-8"> <title>file upload progress bar</title> <script type="text/javascript"> // select file function styling input[type="file"] function select_file(){   document.getelementbyid('image').click();   return false; } </script>  </head> <body> <div class="container">  <!--status message appear here--> <div class="status"></div>  <!--image upload form--> <form class="pure-form" action="upload.php" enctype="multipart/form-data" method="post">    <div class="upload">     <a onclick="select_file()" class="pure-button">choose file</a>     <input id="image" type="file"  multiple="multiple" name="files[]" >   </div>    <!--image preview-->   <img src="" style="display:none">    <input class="pure-button pure-button-primary" type="submit" value="upload!"> </form>    </div> </body> </html>

php scripts:

 header('content-type: application/json');         $path = 'uploads/'; // upload directory  if (!file_exists('uploads')) {  mkdir('uploads', 0777, true);  }  $max_file_size = 1024*10000; // 1024 byte= 1kb 1024*100 byte=100kb  $count = 0;                if ( $_server['request_method'] === 'post' ) { $zip_path = 'download.zip'; $zip = new ziparchive(); if ($zip->open($zip_path,  ziparchive::overwrite) !== true) { die ("an error occurred creating zip file."); }               foreach ($_files['files']['name'] $f => $name) {    $filename = $_files['files']['name'][$f]; $filecontent = file_get_contents($_files["files"]["tmp_name"][$f]); $filetype = $_files['files']['type'][$f]; $filesize = $_files['files']['size'][$f];         $fileext = pathinfo($_files['files']['name'][$f], pathinfo_extension);; $zip->addfromstring($filename, $filecontent); //$zip->addfile('file_on_server.ext', 'second_file_name_within_archive.ext');          if ($_files['files']['error'][$f] == 4) { $status[] ='upload fail: unknown error occurred!'; continue; // skip file if error found }           if ($_files['files']['error'][$f] == 0) {                        if ($_files['files']['size'][$f] > $max_file_size) {          $status[] = "$name large!.";     continue; // skip large files     } else{ // no error found! move uploaded files      if(move_uploaded_file($_files["files"]["tmp_name"][$f], $path.$name)){     $count++; // number of uploaded file     $status[] = 'image uploaded!';     }     else {     $status[] = 'upload fail: unknown error occurred!';     }     }   } } $zip->close(); } else {   $status[] = 'bad request!'; } echo json_encode(array('status' => $status));

it's not working download.zip file doesn't exist in directory. please create download.zip file or replace following code try again: 

if ($zip->open($zip_path,ziparchive::overwrite) !== true)   {   die ("an error occurred creating zip file."); }

with

 if ($zip->open($zip_path,ziparchive::create | ziparchive::overwrite) !== true)  {  die ("an error occurred creating zip file."); }




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