What are some strategies for troubleshooting and debugging complex PHP code that involves database queries and variable manipulation?

Issue: When debugging complex PHP code that involves database queries and variable manipulation, it can be challenging to pinpoint where errors are occurring. One strategy is to break down the code into smaller, manageable chunks and use print statements or debugging tools to inspect the values of variables at different points in the code execution. Code snippet: 

// Connect to the database
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";

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

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

// Query the database
$sql = "SELECT * FROM users WHERE id = 1";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    // Fetch and display the data
    while($row = $result->fetch_assoc()) {
        echo "Name: " . $row["name"]. "<br>";
    }
} else {
    echo "0 results";
}

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

Keywords

PHP debugging database queries variable manipulation error types

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