php - Get Output Status of Data in Database -


i have problem getting results if condition data in database.

the data checkbox-submitted data. if users check checkbox, value "yes." when users uncheck checkbox, value '' (empty).

let's checkbox data : $checkbox , have conditional php code below. want show header of website based on checkbox status using these conditions:

  1. if $checkbox set 'yes' header show.
  2. if $checkbox not set before (there no $checkbox value in database), header show too.
  3. if $checkbox '', header not showing.

i tried this: 

if ( $checkbox == 'yes' || $checkbox == xxx ) {     // show header } else {     // don't show header }

and this:

if ( $checkbox == 'yes' || $checkbox = undefined ) {     // show header } else {     // don't show header }

but still doesn't work expected: when $checkbox '', php reports $checkbox undefined too.

how can check condition (xxx) check data not set before if $checkbox set, condition different?

maybe simple as: 

if (isset($_post['yourcheckboxname']) && $_post['yourcheckboxname'] == 'yes') {    // show header } else {    // don't  }

anyway, who's $checkbox ?


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