Undefined variable: con Call to a member function query() on a non-object

[meenal wadhwa]

pleas help me in resolving error in this part

<div class="output"> <?php $sql ="SELECT * FROM posts";
global $conn;
$result= $conn->query($sql);
$result=mysql_query("SELECT * FROM posts WHERE name='$name' and msg='$msg' ");
if(isset($_POST['name'])&&isset($_POST['msg']))
{
 
$uname=($_POST['name']);
$msg=($_POST['msg']);
}
if($result->num_rows>0) 
while($row = $result->fetch_assoc()){
echo "".$row["name"]." "."::" . $row["msg"]."--" .$row["date"]. "<br>";
}
else{
echo "0 results";
}
$conn->close();
?> </div>

[zmbd]

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