CS 602 Server Side development hw4 please explain and comment the following php code

define('TAX_RATES', array( 'Single' => array( 'Rates' => array(10,15,25,28,33,35,39.6), 'Ranges' => array(0,9275,37650,91150,190150,413350,415050), 'MinTax' => array(0, 927.50,5183.75,18558.75,46278.75,119934.75,120529.75) ), 'Married_Jointly' => array( 'Rates' => array(10,15,25,28,33,35,39.6), 'Ranges' => array(0,18550,75300,151900,231450,413350,466950), 'MinTax' => array(0, 1855.00,10367.50,29517.50,51791.50,111818.50,130578.50) ), 'Married_Separately' => array( 'Rates' => array(10,15,25,28,33,35,39.6), 'Ranges' => array(0,9275,37650,75950,115725,206675,233475), 'MinTax' => array(0, 927.50,5183.75,14758.75,25895.75,55909.25,65289.25) ), 'Head_Household' => array( 'Rates' => array(10,15,25,28,33,35,39.6), 'Ranges' => array(0,13250,50400,130150,210800,413350,441000), 'MinTax' => array(0, 1325.00,6897.50,26835.00,49417,116258.50,125936) ) ) );

function incomeTax($taxableIncome, $status) {

if ($taxableIncome < 0) return 0;

$ranges = TAX_RATES[$status]['Ranges']; $mins = TAX_RATES[$status]['MinTax']; $tax_brackets = TAX_RATES[$status]['Rates'];

$incTax = 0.0;

$index = count($ranges); for ($i = count($ranges) - 1; $i >= 0; $i--) { if ($taxableIncome > $ranges[$i]) { $index = $i; break; } } $incTax = $mins[$index] + $tax_brackets[$index] * ($taxableIncome - $ranges[$index])/100.0;

return $incTax; }

?>

HW4 Part2 - Kalathur

Income Tax Calculator

Enter Net Income:

Submit

if(isset($_POST['netIncome'])) { $netIncome = $_POST['netIncome']; $incTaxSingle = incomeTax($netIncome, 'Single');

$incomeTaxJointly = incomeTax($netIncome, 'Married_Jointly'); $incomeTaxSeparately = incomeTax($netIncome, 'Married_Separately'); $incomeTaxHeadOfHousehold = incomeTax($netIncome, 'Head_Household'); ?>

With a net taxable income of $

Status	Tax
Single	$
Married Filing Jointly	$
Married Filing Separately	$
Head of Household	$

2016 Tax Tables

foreach (TAX_RATES as $status => $status_data) { $ranges = $status_data['Ranges']; $mins = $status_data['MinTax']; $tax_brackets = $status_data['Rates']; $len = count($ranges); ?>

for ($i = 1; $i < ($len-1); $i++) { ?>

Taxable Income	Tax Rate
$ - $	%
$ - $	$ plus % of the amount over $
$ or more	$ plus % of the amount over $