What are some common mistakes made by beginners when implementing tax calculations in PHP?

One common mistake made by beginners when implementing tax calculations in PHP is not properly rounding the final result. It's important to round the calculated tax amount to the correct number of decimal places to ensure accuracy in the final total. 

// Incorrect way of calculating tax without rounding
$subtotal = 100;
$taxRate = 0.08;
$taxAmount = $subtotal * $taxRate;
$total = $subtotal + $taxAmount;

echo "Total with tax: $total";

// Correct way of calculating tax with rounding
$subtotal = 100;
$taxRate = 0.08;
$taxAmount = round($subtotal * $taxRate, 2); // Round to 2 decimal places
$total = $subtotal + $taxAmount;

echo "Total with tax: $total";

Keywords

Syntax errors mathematical errors rounding errors incorrect tax rates missing input validation

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