create and download zip file using php

Why not use the Zip Encoding Class in Codeigniter - it will do this for you

$name = 'mydata1.txt';$data = 'A Data String!';$this->zip->add_data($name, $data);// Write the zip file to a folder on your server. Name it "my_backup.zip"$this->zip->archive('/path/to/directory/my_backup.zip'); // Download the file to your desktop. Name it "my_backup.zip"$this->zip->download('my_backup.zip');

https://www.codeigniter.com/user_guide/libraries/zip.html

... it work for me

public function downloadall(){        $createdzipname = 'myzipfilename';        $this->load->library('zip');        $this->load->helper('download');        $cours_id = $this->input->post('todownloadall');        $files = $this->model_travaux->getByID($cours_id);         // create new folder         $this->zip->add_dir('zipfolder');        foreach ($files as $file) {            $paths = 'http://localhost/uploads/'.$file->file_name.'.docx';            // add data own data into the folder created            $this->zip->add_data('zipfolder/'.$paths,file_get_contents($paths));            }        $this->zip->download($createdzipname.'.zip');    }

1. What is asset_url() function? Try to use APPPATH constant istead this function:

   $resumePath = APPPATH."../uploads/resume/";

2. Add "exists" validation for file names:

   foreach ($fileNames as $files) {    if (is_file($resumePath . $files)) {        $zip->addFile($resumePath . $files, $files);    }}

3. Add exit() after:

   echo json_encode("Cannot Open");

Also I think it's the better desision to use CI zip library User Guide. Simple example:

public function generate_zip($files = array(), $path){    if (empty($files)) {        throw new Exception('Archive should\'t be empty');    }    $this->load->library('zip');    foreach ($files as $file) {        $this->zip->read_file($file);    }    $this->zip->archive($path);}public function download_zip($path){    if (!file_exists($path)) {        throw new Exception('Archive doesn\'t exists');    }    $this->load->library('zip');    $this->zip->download($path);}