show results with same username php - php

Question

I have a database which stores data. How can I view data in my database with the same username as my session? What I have tried is below. There is a session and the username is uploading in each row in the database.
This is what I'm trying to do: say I logged in as jack I typed data in and sent it to the database. It saves the name as jack and then only views the results with jack. But it is saying 0 results. Why?
<?php
session_start();
if (isset($_SESSION['username'])) {
$username = $_SESSION['username'];
echo "$username";
}
$servername = "localhost";
$username = "root";
$password = "root";
$dbname = "score";
$conn = new mysqli($servername, $username, $password, $dbname);
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
$sql = "SELECT id, name, description FROM all_scores WHERE username = '".$username."' ORDER BY id DESC LIMIT 5";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
while($row = $result->fetch_assoc()) {
echo "<p></p>";
echo "". $row["name"]. "";
echo "<p>". $row["description"]. "</p>";
}
} else {
echo "0 results";
}
$conn->close();
?>

Answer 1

you have two mistakes
1- SQL syntax error, correct syntax is
$sql = "SELECT id, name, description FROM all_scores WHERE username = '".$username."'";
2- the variable $username is overwritten by the username of the database
try this:
$sql = "SELECT id, name, description FROM all_scores WHERE username = '".$_SESSION['username']."'";