What best practices should be followed when calculating and displaying percentages based on average values fetched from a database in PHP?

When calculating and displaying percentages based on average values fetched from a database in PHP, it is important to ensure that the calculations are accurate and the percentages are formatted correctly for display. One best practice is to calculate the percentage using the average value and total value, then format the result using number_format() function to ensure proper display of decimal places and commas. Additionally, it's important to handle cases where the total value is zero to avoid division by zero errors. 

// Fetch average value and total value from database
$averageValue = 50; // Example average value
$totalValue = 100; // Example total value

// Calculate percentage
if ($totalValue != 0) {
    $percentage = ($averageValue / $totalValue) * 100;
    $formattedPercentage = number_format($percentage, 2) . '%'; // Format percentage with 2 decimal places and percentage sign
} else {
    $formattedPercentage = 'N/A'; // Handle division by zero case
}

// Display formatted percentage
echo 'Percentage: ' . $formattedPercentage;

Keywords

database average values percentages calculations display

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