After upgrading Laravel from 5.6 to 6.0, Call to undefined str_random() function not working
Likelihood Of Impact: High Laravel 6 Upgrade Guide
In Laravel 6 All str_ and array_ helpers have been moved to the new laravel/helpers Composer package and removed from the framework. If desired, you may update all calls to these helpers to use the Illuminate\Support\Str and Illuminate\Support\Arr classes. Alternatively, you can add the new laravel/helpers package to your application to continue using these helpers:
composer require laravel/helpersIf don't want to add Package then Used Str And Arr Classes.
For Example :
Str::random(12)
Add the following string library.
use Illuminate\Support\Str;now you can use it as below.
$filename = Str::random(40)alternatively, install the following package.
composer require laravel/helpers
In my case, I didn't use any of the string helpers in my app code, so I just had to remove the compiled class file:
php artisan clear-compiled