How can PHP beginners effectively troubleshoot issues with fetching data from a MySQL database in a while loop?

Issue: PHP beginners may face problems when fetching data from a MySQL database in a while loop due to incorrect query execution or improper handling of the fetched data. To effectively troubleshoot this issue, beginners should ensure that the query is executed successfully, check for errors in the query execution, and properly handle the fetched data within the loop. 

// Connect to MySQL database
$connection = mysqli_connect("localhost", "username", "password", "database");

// Check connection
if (!$connection) {
    die("Connection failed: " . mysqli_connect_error());
}

// Select data from database
$query = "SELECT * FROM table";
$result = mysqli_query($connection, $query);

// Check if query was successful
if ($result) {
    // Fetch data and display in a while loop
    while ($row = mysqli_fetch_assoc($result)) {
        echo "ID: " . $row['id'] . " Name: " . $row['name'] . "<br>";
    }
} else {
    echo "Error: " . mysqli_error($connection);
}

// Close connection
mysqli_close($connection);

Keywords

PHP MySQL database fetch while loop

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