How can comparison operators be used effectively in PHP to refine SQL queries?

Comparison operators in PHP can be used effectively in SQL queries to refine the results returned. By using comparison operators such as "=", "<>", ">", "<", ">=", "<=", you can filter data based on specific criteria. This allows you to retrieve only the data that meets certain conditions, making your queries more precise and efficient.

// Example of using comparison operators in a SQL query
$query = "SELECT * FROM users WHERE age > 18 AND gender = 'female'";
$result = mysqli_query($connection, $query);

// Loop through the results
while($row = mysqli_fetch_assoc($result)) {
    // Process each row
}