jquery - Disable all input buttons on page if no PHP session exists -

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i'm doing site voting system. want disable input buttons (the ability vote) if user isnt logged in (ie. session doesnt exist). how do check in php @ top of page , allow/disallow input buttons? use css or jquery?

somewhere in code check if session not set:

if(!isset($_session['some_key'])){    $disable = true; }else{    $disable = false; }

then, in html:

<input type="radio" name="" value=""<?=($disable ? " disabled=\"disabled\"" : "");?>/> vote 1 <input type="radio" name="" value=""<?=($disable ? " disabled=\"disabled\"" : "");?>/> vote 2 <input type="radio" name="" value=""<?=($disable ? " disabled=\"disabled\"" : "");?>/> vote 3

but still have check @ serverside before accept vote, if person has voted before, because form can edited post data again , again.


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