php artisan php warning require code example

Example 1: failed to open stream: No such file or directory in artisan on line 18

The error is due to missing vendor folder.
You just need to run `composer install` in the project directory which will 
create a folder named vendor which will have all composer libraries and 
`autoload.php` file.

Example 2: php artisan php warning require

composer install --ignore-platform-reqs