Resource id #9 showing - php

Question

So i'm trying to get a list of activities(subjects) of a school and i get them all like it's on the Database but i also gives me Resource id #9 i've tried to remake the code so many times but it gives me every single time this.
1st try
<li>
<?php
if(Session[tipo]<=1){
echo "
<li class='treeview'>
<a href='#'>
<i class='fa fa-share'></i> <span>Atividades</span>
<i class='fa fa-angle-left pull-right'></i>
</a>
<ul class='treeview-menu'>
<li>".
$result = mysql_query("select * from atividade_aluno where ativo=1");
while($row = mysql_fetch_object($result)) {
echo "<a href='lista.php?x=$row->id_atividade'>". utf8_encode($row->atividade)."</a>";
?>
<?php
}
?><?php
echo "
</li>
</ul>
</li>";
}else{
echo "<a href='#'>1</a>";
}
?>
</li>
2nd try
<li>
<?php
if(Session[tipo]<=1){
echo "
<li class='treeview'>
<a href='#'>
<i class='fa fa-share'></i> <span>Atividades</span>
<i class='fa fa-angle-left pull-right'></i>
</a>
<ul class='treeview-menu'>
<li>".
$result = mysql_query("select * from atividade_aluno where ativo=1");
while($row = mysql_fetch_array($result, MYSQL_ASSOC)) {
echo "<a href='lista.php?x=".$row["id_atividade"]."'>". utf8_encode($row["atividade"])."</a>";
?>
<?php
}
?><?php
echo "
</li>
</ul>
</li>";
}else{
echo "<a href='#'>1</a>";
}
?>
</li>
PS: The result is the same so i won't upload two pictures of the same.
Thanks you so mutch for your time

Answer 1

The . operator concatenates strings in PHP. For example, this prints "helloworld":
$a = "hello";
$b = "world";
echo $a . $b;
Now, in your code you have this:
<li>".
This concatenates to the next variable ($result). You should change it to:
<li>";

Answer 2

Just change your code to this
<li>
<?php
if(Session[tipo]<=1){
$result = mysql_query("select * from atividade_aluno where ativo=1");
echo "
<li class='treeview'>
<a href='#'>
<i class='fa fa-share'></i> <span>Atividades</span>
<i class='fa fa-angle-left pull-right'></i>
</a>
<ul class='treeview-menu'>
<li>".
while($row = mysql_fetch_object($result)) {
echo "<a href='lista.php?x=$row->id_atividade'>". utf8_encode($row->atividade)."</a>";
?>
<?php
}
?><?php
echo "
</li>
</ul>
</li>";
}else{
echo "<a href='#'>1</a>";
}
?>
</li>
You concatenated $result which is resource id with your string. That is the reason.