You can use CloudLinux Selector to enable or disable the allow_url_fopen directive in DirectAdmin.
1. Log in to your DirectAdmin account.
2. In the Extra Features section, click on Select PHP version or type Select PHP in the navigation filter box. The option will appear. Click on it.
3. Click on the Options menu.
Note: If the Options page shows an error related to the native PHP version, change it to a non-native version first.
4. For enabling allow_url_fopen, tick mark it. For disabling it, uncheck it.
The message will show that the option is enabled or disabled.