(Required) (String) Which file to register or return
If $file is ‘css’ or ‘js’, it will be registered in WordPress.
If $file is ‘reboot’, the ‘reboot.css’ filepath will be returned.
If $file is empty, the Bootstrap version number is returned as a string of either ‘v3’, ‘v4a5’, or ‘latest’.
This checks the Bootstrap Version set in Nebula Options.
This function was not found in /libs/Options/Options.php. Please report this error.
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