What are the best practices for structuring PHP code to ensure readability and prevent errors in chart generation functions?

When structuring PHP code for chart generation functions, it is important to follow best practices to ensure readability and prevent errors. One way to achieve this is by breaking down the code into smaller, more manageable functions that handle specific tasks related to generating the chart. This helps improve code organization and makes it easier to debug and maintain in the future.

<?php

// Define a function to generate the chart data
function generateChartData($data) {
    // Code to process and format the data for the chart
    return $formattedData;
}

// Define a function to render the chart
function renderChart($chartData) {
    // Code to generate the chart using the formatted data
    echo $chartMarkup;
}

// Main code to generate and render the chart
$data = fetchDataFromDatabase();
$chartData = generateChartData($data);
renderChart($chartData);

?>