What to do if the session is not saved successfully in Laravel 5.4.36

Laravel is a PHP framework. When using laravel, you will encounter session usage problems. At work, the session default file cache is used. After using it, I found session()->put("key ","values") was not set successfully. Finally, I checked the source code and found that when using file caching, I need to use the save() method to persist it to the database.

Source code: vendor/laravel/framework/src/Illuminate/Session/Store.php

/**
  * Save the session data to storage.
  *
  * @return bool
  */
 public function save()
 {
  $this->ageFlashData();

  $this->handler->write($this->getId(), $this->prepareForStorage(
   serialize($this->attributes)
  ));
  $this->started = false;
 }

Due to the use of file caching, the source code of the write method call: vendor/laravel/framework/src/Illuminate/Session/FileSessionHandler.php

/**
  * {@inheritdoc}
  */
 public function write($sessionId, $data)
 {
  $this->files->put($this->path.'/'.$sessionId, $data, true);

  return true;
 }

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