Drupal 8 - Rename public directory from web to public_html

If you use composer for Drupal 8, default you have your public data inside web directory. To change that, you need to edit composer.json and find extra section:

    "extra": {
        "installer-paths": {
            "web/core": ["type:drupal-core"],
            "web/libraries/{$name}": ["type:drupal-library"],
            "web/modules/contrib/{$name}": ["type:drupal-module"],
            "web/profiles/contrib/{$name}": ["type:drupal-profile"],
            "web/themes/contrib/{$name}": ["type:drupal-theme"],
            "drush/contrib/{$name}": ["type:drupal-drush"]
        }
    }

Change web, to your directory, for example public_html. So composer.json become:

    "extra": {
        "installer-paths": {
            "public_html/core": ["type:drupal-core"],
            "public_html/libraries/{$name}": ["type:drupal-library"],
            "public_html/modules/contrib/{$name}": ["type:drupal-module"],
            "public_html/profiles/contrib/{$name}": ["type:drupal-profile"],
            "public_html/themes/contrib/{$name}": ["type:drupal-theme"],
            "drush/contrib/{$name}": ["type:drupal-drush"]
        }
    }

You need to regenerate autoload declarations. To refresh autoloading from composer, run command:

composer dump-autoload

Run your website, should works fine if you renamed /web to /public_html

Short checklist in case of any problems:

1. Rename folder /web to /public_html
2. Modify extra section in composer.json
3. composer dump-autoload
4. Setup domain/vhost to point on a new folder and reload server configuration if needed