How can data validation be implemented in PHP forms to prevent errors in calculations?

Data validation in PHP forms can be implemented by checking the input data before performing any calculations. This can prevent errors in calculations caused by invalid or unexpected input. By validating the data types, ranges, and formats of the input, you can ensure that the calculations are performed accurately. 

// Example of data validation in PHP form to prevent errors in calculations

// Retrieve user input from form
$number1 = $_POST['number1'];
$number2 = $_POST['number2'];

// Validate input data
if (!is_numeric($number1) || !is_numeric($number2)) {
    echo "Invalid input. Please enter numeric values.";
} else {
    // Perform calculation
    $result = $number1 + $number2;
    echo "The result of the calculation is: " . $result;
}

Keywords

data validation PHP forms errors calculations prevent

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