What is the significance of using mysql_errno() in PHP error handling?

Using mysql_errno() in PHP error handling is significant because it allows you to retrieve the error number associated with the most recent MySQL operation. This can help you determine the specific cause of the error and handle it accordingly in your code.

// Perform a MySQL query
$result = mysqli_query($conn, "SELECT * FROM table");

// Check for errors
if (!$result) {
    echo "Error: " . mysqli_error($conn);
    echo "Error number: " . mysqli_errno($conn);
    // Handle the error accordingly
}