php - Place variable into value attribute -

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i have problem, system work need place php variable (function prefer) value attribute in html form, possible?
may different way cope problem. 

 <input type="hidden" name="sum" value="<?php $payment ?>">  <input type="hidden" name="account" value="<?php $acc ?>">  <input type="hidden" name="desc" value="<?php $info ?>">

use echo set value:

<input type="hidden" name="sum" value="<?php isset($payment) ?  $payment : '' ; ?>"> <input type="hidden" name="account" value="<?php isset($acc) ? $acc : '' ; ?>"> <input type="hidden" name="desc" value="<?php isset($info) ? $info : '' ; ?>">

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