checkbox always in unchecked status no matter if is checked or not -

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i using chekbox in code showing unchecked .i using chekbox show below in form , on submit ion cheking value if statement shown below 

    <label class="checkbox">     <input type="checkbox" name="auto"><p>i accept </p>     </label>   if(isset($_post['auto'])) {     echo "checked";  }  else {    echo "unchecked"; }

some browser not support defalut value of "on". more stable solution - 

<label class="checkbox">     <input type="checkbox" name="auto" value="on" /><p>i accept </p> </label>

and same php code. 

if(isset($_post['auto'])) {     echo "checked"; } else {     echo "unchecked"; }

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