How can PHP logic be adjusted to address control flow problems when handling SQL query results?

When handling SQL query results in PHP, it is important to adjust the logic to account for control flow problems such as empty result sets or errors in the query execution. One way to address this is by using conditional statements to check for the presence of results before attempting to process them further. Additionally, error handling mechanisms should be implemented to catch any potential issues that may arise during the query execution.

// Execute SQL query
$query = "SELECT * FROM users";
$result = mysqli_query($conn, $query);

// Check if query was successful
if ($result) {
    // Check if there are any results
    if (mysqli_num_rows($result) > 0) {
        // Process results
        while ($row = mysqli_fetch_assoc($result)) {
            // Do something with the data
        }
    } else {
        echo "No results found.";
    }
} else {
    echo "Error executing query: " . mysqli_error($conn);
}