create helper function in laravel code example

Example 1: laravel add utility class

# 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`

Example 2: autoload helper in laravel

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"
  ]
  
  ..............
}

Example 3: add custom helper laravel

"autoload": {
    "files": [
        "app/helpers.php"
    ],
    "classmap": [
        "database/seeds",
        "database/factories"
    ],
    "psr-4": {
        "App\\": "app/"
    }
},

Example 4: add custom helper laravel

composer dump-autoload

Example 5: laravel helper functions

$callback = function ($value) {
    return (is_numeric($value)) ? $value * 2 : 0;
};

$result = with(5, $callback);

// 10

$result = with(null, $callback);

// 0

$result = with(5, null);

// 5

Example 6: laravel helper function custom

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
    ]
},

After adding that to your composer.json file, run the following command:

composer dump-autoload