What are some common debugging techniques for identifying errors in PHP MySQL queries?

One common debugging technique for identifying errors in PHP MySQL queries is to use the mysqli_error() function to display the error message generated by the most recent MySQL function call. This can help pinpoint where the issue lies in the query. Additionally, using var_dump() or print_r() to display the query result can help identify any unexpected output or data.

// Example code snippet using mysqli_error() function for debugging MySQL queries
$query = "SELECT * FROM users WHERE id = 1";
$result = mysqli_query($connection, $query);

if (!$result) {
    echo "Error: " . mysqli_error($connection);
} else {
    while ($row = mysqli_fetch_assoc($result)) {
        print_r($row);
    }
}