Create a file with Drupal 8

Example:

// Programmatically create files.

use Drupal\file\Entity\File;

$file = File::create([

  'uid' => 1,

  'filename' => 'test.txt',

  'uri' => 'public://page/test.txt',

  'status' => 1,

]);

$file->save();

NOTE : This will not create a file in the DB but not in the disk.

To save data: You must do like that:

    $dir = dirname($file->getFileUri());

    if (!file_exists($dir)) {

      mkdir($dir, 0770, TRUE);

    }

    file_put_contents($file->getFileUri(), "test");

   $file->save();

And also:

        $file_usage = \Drupal::service('file.usage');

        $file_usage->add($file, 'mymodule', 'user',$uid);

        $file->save();

Solution 2.

You can create a file and save data at once.

$file = file_save_data($value, "public://$dir/$filename", FILE_EXISTS_RENAME);

Get the real file path:

$path = drupal_realpath($file->getFileUri());

It may also work in this way (not tested)

$handle = fopen('<path to local file>', 'r');

$file = file_save_data($handle, 'public://<filename>');

fclose($handle);

Drupal File folders:

Drupal use 3 folders to store file.

private://    Private files directory

public://    Public files directory

temporary://    Tempory files directory