Create a file called helpers.php in the app/ directory. Paste the code inside it.
Go to composer.json and add files to autoload so that it looks like this:
"autoload": {
    "psr-4": {
        "App\\": "app/"
    },
    "files": [
        "app/helpers.php"
    ]
},Run composer dump-autoload to load the newly created helpers file.
lumen 11 and I'm using this config_path.
thank you.