cookies - PHP $_COOKIE to remember checkbox result -

i'm trying project remember if user has pressed checkbox or not if return site.

on html form have following checkbox (will reload page onchange)

<input type="checkbox" name="showcabin" <?php echo $_cookie['selectedcabin']?> onchange="document.getelementbyid('maininput').submit()" >  <label for="checkbox">show cabin</label> 

the below php run when user first runs page

<?php  print_r ($_cookie); //using see result stored on page load - blank(apart session id)  //check see if check box selected prior page reload              if (isset($_post['showcabin'])){                  $selectedcabin = 'checked="checked"';  //if checkbox wasn't ticked when page loaded, there stored variable in cookie             }elseif ($_cookie['selectedcabin'] == 'checked="checked"'){                 $selectedcabin = 'checked="checked"';             }else{  //if not leave variable blank                 $selectedcabin ='';             }   $_cookie["selectedcabin"] = $selectedcabin;  echo $_cookie["selectedcabin"];  ?> 

i can't variable $selectedcabin retain information after close browser , reopen.

i'm aware there's ways javascript, javascript knowledge very limited, don't want go down route if possible

thanks!

you not setting cookie correctly. use this

<?php $cookie_name = "showcabin"; $cookie_value = "checked='checked'"; setcookie($cookie_name, $cookie_value, time() + (86400 * 30), "/"); // cookie expire in 86400s = 1 day ?> 

to set cookies