add custom helper laravel

"autoload": {
    "files": [
        "app/helpers.php"
    ],
    "classmap": [
        "database/seeds",
        "database/factories"
    ],
    "psr-4": {
        "App\\": "app/"
    }
},
"autoload": {
    "classmap": [
        "database/seeds",
        "database/factories"
    ],
    "psr-4": {
        "App\\": "app/"
    }
},
"autoload-dev": {
    "psr-4": {
        "Tests\\": "tests/"
    }
},
composer dump-autoload
1. Create a helpers.php file in your app folder and load it up with composer:

"autoload": {
    "classmap": [
        ...
    ],
    "psr-4": {
        "App\\": "app/"
    },
    "files": [
        "app/helpers.php" // <---- ADD THIS
    ]
},

2. After adding that to your composer.json file, run the following command:
	composer dump-autoload

3. If you dont like keeping your helpers.php file in your app directory
(because it is not a PSR-4 namespaced class file), you can do what the 
laravel.com website does: store the helpers.php in the bootstrap directory. 
Remember to set it in your composer.json file:

"autoload": {
  ..........
    
  "files": [
      "app/Helpers/helpers.php"
  ]
  
  ..............
}# How to register utilities class on Laravel 5.8
# File: composer.json
# ref: https://stackoverflow.com/questions/28290332/best-practices-for-custom-helpers-in-laravel-5
"autoload": {
    "classmap": [
        ...
    ],
    "psr-4": {
        "App\\": "app/"
    },
    "files": [
        "app/helpers.php" // <---- ADD THIS
    ]
},
 
 # Then run: `composer dump-autoload`