How can PHP developers ensure that their queries return the expected results, especially when dealing with complex conditions like date and time ranges?

When dealing with complex conditions like date and time ranges in PHP queries, developers can ensure that their queries return the expected results by using proper formatting and comparison techniques. It's important to correctly format dates and times, use the appropriate comparison operators (e.g., greater than, less than), and consider time zones if applicable. Testing the queries with different date and time inputs can also help verify that the results are as expected.

// Example code snippet for querying data within a specific date range
$start_date = '2022-01-01';
$end_date = '2022-01-31';

$query = "SELECT * FROM table_name WHERE date_column >= '$start_date' AND date_column <= '$end_date'";
$result = mysqli_query($connection, $query);

// Loop through the results and process them accordingly
while($row = mysqli_fetch_assoc($result)) {
    // Process each row as needed
}