In PHP, what are the advantages and disadvantages of using separate queries versus combining multiple joins in a single query when retrieving data from different tables?

When retrieving data from different tables in PHP, using separate queries can be advantageous for simplicity and readability of the code. However, combining multiple joins in a single query can be more efficient in terms of performance as it reduces the number of database calls. It is important to consider the trade-offs between readability and performance when deciding whether to use separate queries or combine joins in a single query.

// Using separate queries
$query1 = "SELECT * FROM table1 WHERE condition";
$result1 = mysqli_query($connection, $query1);

$query2 = "SELECT * FROM table2 WHERE condition";
$result2 = mysqli_query($connection, $query2);

// Using multiple joins in a single query
$query = "SELECT * FROM table1 
          JOIN table2 ON table1.id = table2.id 
          WHERE condition";
$result = mysqli_query($connection, $query);