html - Can't get value checkbox checked form php -

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my checkbox not value after sending form ...

my form

<input name="username" type="text" autocomplete="off" id="username" /> <input type="checkbox" id="atur_peg" name="atur_peg" value="ya" checked />

my php

<?php  echo $username=$_post['username']; // can value echo $atur_peg=$_post['atur_peg']; // , can't value  ?>

this full form

<form class="cmxform" id="tambahuser"  name="kepuasan_user" method="post" action="user/tambahuserproses.php">  <label>username</label> : <input name="username" type="text" autocomplete="off" id="username"  size="40" maxlength="50" /> <span id="pesan"></span>   <br />   <label>password</label> : <input name="password" type="password" autocomplete="off" id="password" class="showpassword" size="40" maxlength="50" />        <p> <label><strong>atur untuk pegawai ?</strong></label><input type="checkbox" id="atur_peg" name="atur_peg" value="ya" checked />ya   </p>     </form>

how correct ?

if checkbox checked value in $_post.

<form method="post" action=""> <input name="username" type="text" autocomplete="off" id="username" /> <input type="checkbox" id="atur_peg" name="atur_peg" value="ya" /> <input type="submit" name="submit" value="submit"> </form> <?php if (isset($_post['atur_peg'])) {   $checkboxvalue = "yes"; } else {   $checkboxvalue = "no"; }  echo $checkboxvalue; ?>

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