What are some best practices for optimizing PHP code to save traffic?

One best practice for optimizing PHP code to save traffic is to minimize the number of database queries by combining multiple queries into a single query whenever possible. This reduces the amount of data that needs to be transferred between the web server and the database server, ultimately saving on network traffic. 

// Example of combining multiple queries into a single query
$query = "SELECT * FROM table1 WHERE id = 1; SELECT * FROM table2 WHERE id = 2;";
$result = $conn->multi_query($query);

// Process the results of the combined query
if ($result) {
    do {
        if ($res = $result->store_result()) {
            while ($row = $res->fetch_assoc()) {
                // Process the data
            }
            $res->free();
        }
    } while ($result->next_result());
}

Keywords

caching opcode profiling minification gzip

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