What are some best practices for integrating PHP code with charting libraries to ensure smooth functionality and performance?

When integrating PHP code with charting libraries, it is important to ensure smooth functionality and performance by properly handling data processing and rendering. One best practice is to organize your data in a format that is easily consumable by the charting library, such as an array or JSON object. Additionally, make sure to optimize your code for efficiency by minimizing unnecessary calculations and loops.

// Example PHP code snippet for integrating PHP with charting library

// Sample data array
$data = array(
    array("Year" => 2018, "Sales" => 1000),
    array("Year" => 2019, "Sales" => 1500),
    array("Year" => 2020, "Sales" => 2000)
);

// Convert data array to JSON for charting library
$json_data = json_encode($data);

// Output JSON data for charting library
echo $json_data;