update_option function not working

  • Hi Guys,

    Please help me with the function not working inside a callback function for register_setting.

    ex:

    register_setting(‘set’, ‘set2’, ‘sanitize’);

    function sanitize($input){
    if(input){
    update_option(‘theme_option’,$input);
    }

    If adding that it will never worked and on my experience xampp and wamp are crashing.

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