Require this package in your composer.json
and update composer. Run/add either of the below two commands
"sambenne/laravel-string-diff": "dev-master"
or
composer require sambenne/laravel-string-diff=dev-master
After updating composer, add the ServiceProvider to the providers array in app/config/app.php
'SamBenne\LaravelStringDiff\Providers\StringDiffServiceProvider',