Undefined index – get_option

By default get_option gets you the value of your option.

I don’t know anything about the specific option or the way it’s configured. But basic knowledge of PHP suggests to me that the option simple_news_settings doesn’t have an array key of simple_news_checkbox_css in some cases. So PHP is telling you the array doesn’t have the key (or index, as that’s the language of the error). An isset($options['simple_news_checkbox_css']) check before you try to access the value would stop PHP from complaining.

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