"how to change public folder to public_html in laravel 5" Code Answer

Quite easy to find this with a simple search.

See: https://laracasts.com/discuss/channels/general-discussion/where-do-you-set-public-directory-laravel-5

In your index.php add the following 3 lines.

/*
|--------------------------------------------------------------------------
| Turn On The Lights
|--------------------------------------------------------------------------
|
| We need to illuminate PHP development, so let us turn on the lights.
| This bootstraps the framework and gets it ready for use, then it
| will load up this application so that we can run it and send
| the responses back to the browser and delight our users.
|
*/

$app = require_once __DIR__.'/../bootstrap/app.php';

// set the public path to this directory
$app->bind('path.public', function() {
    return __DIR__;
});

Edit:

As Burak Erdem mentioned, another option (and more preferable) is to put this in the AppProvidersAppServiceProvider register() method.

/**
 * Register any application services.
 *
 * @return void
 */
public function register()
{
    // ...

    $this->app->bind('path.public', function() {
        return base_path('public_html');
    });
}