How do I write php code to check if checkbox is checked or not? -

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how write php code check if checkbox checked or not ? if checkbox selected yes value stored in database, , if checkbox not selected, no valued stored in database. how that? know how connect database etc. 

<input type="checkbox" name="cb1" value="yes" />  $cb1 = ($_post['cb1'] == 'yes')?'yes':'no';

if checkbox not clicked value null i.e. variable $_post['cb1'] not set.


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