Echoing html if data from SQL if statement true - php

Question

So I've been struggling at how to echo this set of HTML with users that are set as admin from my database. I've looked at quite a few places for information but I'm struggling to get it to work. Perhaps I'm doing something really stupid. Thanks for your help.
<?php
$steamidb =&$steamprofile['steamid'];
$steamhextoid=dechex($steamidb);
$steamstart = 'steam:';
$steamhextoidfin = $steamstart . '' . $steamhextoid;
$sql = "SELECT group FROM users WHERE identifier='".$steamhextoidfin."'";
$result = $conn->query($sql);
if ($result->num_rows > 0)
// output data of each row
while($row = mysql_fetch_assoc($result))
{
if($row['group'] == 'admin')
{
echo '<li class="sub-menu">
<a href="javascript:;" >
<i class="fa fa-cogs"></i>
<span>Admin</span>
</a>
<!--<ul class="sub">
<li>COMING SOON</li>
<li>Buttons</li>
<li>Panels</li>
</ul>-->
</li>';
}
else {
echo "Error";
}
}
?>

Answer 1

I think that you forgot to put the while between {}. Here is the correct code:
<?php
$steamidb =&$steamprofile['steamid'];
$steamhextoid=dechex($steamidb);
$steamstart = 'steam:';
$steamhextoidfin = $steamstart . '' . $steamhextoid;
$sql = "SELECT group FROM users WHERE identifier='".$steamhextoidfin."'";
$result = $conn->query($sql);
if ($result->num_rows > 0){
// output data of each row
while($row = mysql_fetch_assoc($result))
{
if($row['group'] == 'admin')
{
echo '<li class="sub-menu">
<a href="javascript:;" >
<i class="fa fa-cogs"></i>
<span>Admin</span>
</a>
<!--<ul class="sub">
<li>COMING SOON</li>
<li>Buttons</li>
<li>Panels</li>
</ul>-->
</li>';
}
else {
echo "Error";
}
}
}
?>