What steps should be taken to ensure the proper functioning of PHP code that retrieves and displays data from a database for a ranking system?

To ensure the proper functioning of PHP code that retrieves and displays data from a database for a ranking system, it is important to properly establish a connection to the database, execute the query to retrieve the necessary data, and handle any errors that may occur during the process. Additionally, the retrieved data should be displayed in a clear and organized manner to accurately represent the ranking system. 

<?php
// Establish a connection to the database
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database_name";

$conn = new mysqli($servername, $username, $password, $dbname);

// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

// Execute query to retrieve data for ranking system
$sql = "SELECT * FROM ranking_table ORDER BY score DESC";
$result = $conn->query($sql);

// Display retrieved data in a table format
if ($result->num_rows > 0) {
    echo "<table>";
    echo "<tr><th>Rank</th><th>Name</th><th>Score</th></tr>";
    $rank = 1;
    while($row = $result->fetch_assoc()) {
        echo "<tr><td>".$rank."</td><td>".$row["name"]."</td><td>".$row["score"]."</td></tr>";
        $rank++;
    }
    echo "</table>";
} else {
    echo "No data found";
}

// Close database connection
$conn->close();
?>

Keywords

PHP database retrieval ranking system error handling

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