388 lines
16 KiB
PHP
388 lines
16 KiB
PHP
<?php
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/* Copyright (C) 2002 David Tufts <http://dave.imarc.net>
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* Copyright (C) 2014 Alexandre Spangaro <alexandre.spangaro@gmail.com>
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* Copyright (C) 2015 Frederic France <frederic.france@free.fr>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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require '../main.inc.php';
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$langs->load("loan");
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/* --------------------------------------------------- *
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* Set Form DEFAULT values
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* --------------------------------------------------- */
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$default_sale_price = "150000";
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$default_annual_interest_percent = 7.0;
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$default_year_term = 30;
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$default_down_percent = 10;
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$default_show_progress = TRUE;
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/* --------------------------------------------------- *
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* Initialize Variables
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* --------------------------------------------------- */
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$sale_price = 0;
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$annual_interest_percent = 0;
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$year_term = 0;
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$down_percent = 0;
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$this_year_interest_paid = 0;
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$this_year_principal_paid = 0;
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$form_complete = false;
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$show_progress = false;
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$monthly_payment = false;
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$show_progress = false;
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$error = false;
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/* --------------------------------------------------- *
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* Set the USER INPUT values
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* --------------------------------------------------- */
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if (isset($_REQUEST['form_complete'])) {
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$sale_price = $_REQUEST['sale_price'];
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$annual_interest_percent = $_REQUEST['annual_interest_percent'];
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$year_term = $_REQUEST['year_term'];
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$down_percent = $_REQUEST['down_percent'];
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$show_progress = (isset($_REQUEST['show_progress'])) ? $_REQUEST['show_progress'] : false;
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$form_complete = $_REQUEST['form_complete'];
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}
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// This function does the actual mortgage calculations
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// by plotting a PVIFA (Present Value Interest Factor of Annuity)
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// table...
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function get_interest_factor($year_term, $monthly_interest_rate) {
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global $base_rate;
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$factor = 0;
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$base_rate = 1 + $monthly_interest_rate;
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$denominator = $base_rate;
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for ($i=0; $i < ($year_term * 12); $i++) {
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$factor += (1 / $denominator);
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$denominator *= $base_rate;
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}
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return $factor;
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}
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// If the form is complete, we'll start the math
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if ($form_complete) {
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// We'll set all the numeric values to JUST
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// numbers - this will delete any dollars signs,
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// commas, spaces, and letters, without invalidating
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// the value of the number
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$sale_price = preg_replace( "[^0-9.]", "", $sale_price);
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$annual_interest_percent = preg_replace( "[^0-9.]", "", $annual_interest_percent);
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$year_term = preg_replace( "[^0-9.]", "", $year_term);
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$down_percent = preg_replace( "[^0-9.]", "", $down_percent);
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if ((float) $year_term <= 0) {
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$errors[] = "You must enter a <b>Sale Price of Home</b>";
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}
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if ((float) $sale_price <= 0) {
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$errors[] = "You must enter a <b>Length of Mortgage</b>";
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}
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if ((float) $annual_interest_percent <= 0) {
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$errors[] = "You must enter an <b>Annual Interest Rate</b>";
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}
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if (!$errors) {
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$month_term = $year_term * 12;
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$down_payment = $sale_price * ($down_percent / 100);
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$annual_interest_rate = $annual_interest_percent / 100;
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$monthly_interest_rate = $annual_interest_rate / 12;
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$financing_price = $sale_price - $down_payment;
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$monthly_factor = get_interest_factor($year_term, $monthly_interest_rate);
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$monthly_payment = $financing_price / $monthly_factor;
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}
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} else {
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if (!$sale_price) { $sale_price = $default_sale_price; }
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if (!$annual_interest_percent) { $annual_interest_percent = $default_annual_interest_percent; }
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if (!$year_term) { $year_term = $default_year_term; }
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if (!$down_percent) { $down_percent = $default_down_percent; }
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if (!$show_progress) { $show_progress = $default_show_progress; }
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}
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if (! empty($errors)) {
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setEventMessages('', $errors, 'errors');
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$form_complete = false;
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}
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/*
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* View
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*/
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llxHeader();
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print $langs->trans('LoanCalcDesc');
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print '<form method="GET" name="information" action="'.$_SERVER['PHP_SELF'].'">';
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print '<input type="hidden" name="form_complete" value="1">';
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print '<table cellpadding="2" cellspacing="0" border="0" width="100%">';
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//print '<tr>';
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//print '<td align="right"><img src="/images/clear.gif" width="225" height="1" border="0" alt=""></td>';
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//print '<td align="smalltext" width="100%"><img src="/images/clear.gif" width="250" height="1" border="0" alt=""></td>';
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//print '</tr>';
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print '<tr bgcolor="#cccccc">';
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print '<td align="center" colspan="2"><b>Purchase & Financing Information</b></td>';
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print '</tr>';
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print '<tr bgcolor="#eeeeee">';
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print '<td align="right">Sale Price of Home:</td>';
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print '<td><input type="text" size="10" name="sale_price" value="'.$sale_price.'"> '.$langs->trans("Currency".$conf->currency).'</td>';print '</tr>';
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print '<tr bgcolor="#eeeeee">';
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print '<td align="right">Percentage Down:</td>';
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print '<td><input type="text" size="5" name="down_percent" value="'.$down_percent.'">%</td>';
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print '</tr>';
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print '<tr bgcolor="#eeeeee">';
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print '<td align="right">Length of Mortgage:</td>';
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print '<td><input type="text" size="3" name="year_term" value="'.$year_term.'">years</td>';
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print '</tr>';
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print '<tr bgcolor="#eeeeee">';
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print '<td align="right">Annual Interest Rate:</td>';
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print '<td><input type="text" size="5" name="annual_interest_percent" value="'.$annual_interest_percent.'">%</td>';
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print '</tr>';
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print '<tr bgcolor="#eeeeee">';
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print '<td align="right">Explain Calculations:</td>';
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if (! empty($show_progress))
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{
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print '<td><input type="checkbox" name="show_progress" value="1" checked>Show me the calculations and amortization</td>';
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}
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else
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{
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print '<td><input type="checkbox" name="show_progress" value="1">Show me the calculations and amortization</td>';
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}
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print '</tr>';
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print '</table>';
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print '<br><center><input class="button" type="submit" value="'.$langs->trans("Calculate").'"> ';
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print '<input class="button" type="submit" name="cancel" value="'.$langs->trans("Cancel").'"></center>';
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// If the form has already been calculated, the $down_payment
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// and $monthly_payment variables will be figured out, so we can show them in this table
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if ($form_complete && $monthly_payment)
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{
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print '<br>';
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print '<table cellpadding="2" cellspacing="0" border="0" width="100%">';
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print '<tr valign="top">';
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print '<td align="center" colspan="2" bgcolor="#000000"><font color="#ffffff"><b>Mortgage Payment Information</b></font></td>';
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print '</tr>';
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print '<tr valign="top" bgcolor="#eeeeee">';
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print '<td align="right">Down Payment:</td>';
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print '<td><b>' . number_format($down_payment, "2", ".", ",") . ' ' . $langs->trans("Currency".$conf->currency) . '</b></td>';
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print '</tr>';
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print '<tr valign="top" bgcolor="#eeeeee">';
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print '<td align="right">Amount Financed:</td>';
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print '<td><b>' . number_format($financing_price, "2", ".", ",") . ' ' . $langs->trans("Currency".$conf->currency) . '</b></td>';
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print '</tr>';
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print '<tr valign="top" bgcolor="#cccccc">';
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print '<td align="right">Monthly Payment:</td>';
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print '<td><b>' . number_format($monthly_payment, "2", ".", ",") . ' ' . $langs->trans("Currency".$conf->currency) . '</b><br><font>(Principal & Interest ONLY)</font></td>';
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print '</tr>';
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if ($down_percent < 20)
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{
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$pmi_per_month = 55 * ($financing_price / 100000);
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print '<tr valign="top" bgcolor="#FFFFCC">';
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print '<td align="right"> </td>';
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print '<td>';
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print '<br>';
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echo 'Since you are putting LESS than 20% down, you will need to pay PMI
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(<a href="http://www.google.com/search?hl=en&q=private+mortgage+insurance">Private Mortgage Insurance</a>), which tends
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to be about $55 per month for every $100,000 financed (until you have paid off 20% of your loan). This could add
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'."\$" . number_format($pmi_per_month, "2", ".", ",").' to your monthly payment.';
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print '</td>';
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print '</tr>';
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print '<tr valign="top" bgcolor="#FFFF99">';
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print '<td align="right">Monthly Payment:</td>';
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print '<td><b>' . number_format(($monthly_payment + $pmi_per_month), "2", ".", ",") . $langs->trans("Currency".$conf->currency) . '</b><br><font>';
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print '(Principal & Interest, and PMI)</td>';
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print '</tr>';
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}
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print '<tr valign="top" bgcolor="#CCCCFF">';
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print '<td align="right"> </td>';
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print '<td>';
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print '<br>';
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$assessed_price = ($sale_price * .85);
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$residential_yearly_tax = ($assessed_price / 1000) * 14;
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$residential_monthly_tax = $residential_yearly_tax / 12;
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if ($pmi_per_month)
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{
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$pmi_text = "PMI and ";
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}
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echo "Residential (or Property) Taxes are a little harder to figure out... In Massachusetts, the average resedential tax rate seems
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to be around $14 per year for every $1,000 of your property's assessed value.";
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print '<br><br>';
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print "Let's say that your property's <i>assessed value</i> is 85% of what you actually paid for it - ";
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print number_format($assessed_price, "2", ".", ",") . ' ' . $langs->trans("Currency".$conf->currency) . 'This would mean that your yearly residential taxes will be around';
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print number_format($residential_yearly_tax, "2", ".", ",") . ' ' . $langs->trans("Currency".$conf->currency);
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print 'This could add ' . number_format($residential_monthly_tax, "2", ".", ",") . ' ' . $langs->trans("Currency".$conf->currency) . 'to your monthly payment';
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print '</td>';
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print '</tr>';
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print '<tr valign="top" bgcolor="#9999FF">';
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print '<td align="right">TOTAL Monthly Payment:</td>';
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print '<td><b>' . number_format(($monthly_payment + $pmi_per_month + $residential_monthly_tax), "2", ".", ",") . ' ' . $langs->trans("Currency".$conf->currency) . '</b><br><font>';
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print '(including '.$pmi_text.' residential tax)</font></td>';
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print '</tr>';
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}
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print '</table>';
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print '</form>';
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// This prints the calculation progress and
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// the instructions of HOW everything is figured
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// out
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if ($form_complete && $show_progress) {
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$step = 1;
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print '<br><br>';
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print '<table cellpadding="5" cellspacing="0" border="1" width="100%">';
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print '<tr valign="top">';
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print '<td><b>'. $step++ .'</b></td>';
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print '<td>';
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echo 'The <b>down payment</b>
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= The price of the home multiplied by the percentage down divided by 100 (for 5% down becomes 5/100 or 0.05)<br><br>
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' . number_format($down_payment,"2",".",",") . ' ' . $langs->trans("Currency".$conf->currency) . ' = '.number_format($sale_price,"2",".",",") . ' ' . $langs->trans("Currency".$conf->currency) . ' X
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('.$down_percent.' / 100)';
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print '</td>';
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print '</tr>';
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print '<tr valign="top">';
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print '<td><b>' . $step++ . '</b></td>';
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print '<td>';
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print 'The <b>interest rate</b> = The annual interest percentage divided by 100<br><br>';
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print $annual_interest_rate . ' = ' . $annual_interest_percent . '% / 100';
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print '</td>';
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print '</tr>';
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print '<tr valign="top" bgcolor="#cccccc">';
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print '<td colspan="2">';
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print 'The <b>monthly factor</b> = The result of the following formula:';
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print '</td>';
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print '</tr>';
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print '<tr valign="top">';
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print '<td><b>' . $step++ . '</b></td>';
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print '<td>';
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print 'The <b>monthly interest rate</b> = The annual interest rate divided by 12 (for the 12 months in a year)<br><br>';
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print $monthly_interest_rate . ' = ' . $annual_interest_rate . ' / 12';
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print '</td>';
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print '</tr>';
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print '<tr valign="top">';
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print '<td><b>' . $step++ . '</b></td>';
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print '<td>';
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print 'The <b>month term</b> of the loan in months = The number of years you\'ve taken the loan out for times 12<br><br>';
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print $month_term . ' Months = ' . $year_term . ' Years X 12';
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print '</td>';
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print '</tr>';
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print '<tr valign="top">';
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print '<td><b>' . $step++ . '</b></td>';
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print '<td>';
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print 'The montly payment is figured out using the following formula:<br>';
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print 'Monthly Payment = ' . number_format($financing_price, "2", "", "") . ' * ';
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print $langs->trans('MonthlyPayment').' = ' . number_format($financing_price, "2", "", "") . ' * ';
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print '(1 - ((1 + ' . number_format($monthly_interest_rate, "4", "", "") . ')';
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print '<sup>-(' . $month_term . ')</sup>)))';
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print '<br><br>';
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print 'The <a href="#amortization">amortization</a> breaks down how much of your monthly payment goes towards the bank\'s interest,';
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print 'and how much goes into paying off the principal of your loan.';
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print '</td>';
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print '</tr>';
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print '</table>';
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print '<br>';
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// Set some base variables
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$principal = $financing_price;
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$current_month = 1;
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$current_year = 1;
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// This basically, re-figures out the monthly payment, again.
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$power = -($month_term);
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$denom = pow((1 + $monthly_interest_rate), $power);
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$monthly_payment = $principal * ($monthly_interest_rate / (1 - $denom));
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print "<br><br><a name=\"amortization\"></a>Amortization For Monthly Payment: <b>" . number_format($monthly_payment, "2", ".", ",") . "</b> over " . $year_term . " years<br>\n";
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print '<table class="noborder" width="100%">';
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// This LEGEND will get reprinted every 12 months
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$legend = '<tr class="liste_titre">';
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$legend.= '<td class="liste_titre" align="center">' . $langs->trans("Month") . '</td>';
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$legend.= '<td class="liste_titre" align="center">' . $langs->trans("Interest") . '</td>';
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$legend.= '<td class="liste_titre" align="center">' . $langs->trans("Capital") . '</td>';
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$legend.= '<td class="liste_titre" align="center">' . $langs->trans("Position") . '</td>';
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$legend.= '</tr>';
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print $legend;
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// Loop through and get the current month's payments for
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// the length of the loan
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while ($current_month <= $month_term)
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{
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$interest_paid = $principal * $monthly_interest_rate;
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$principal_paid = $monthly_payment - $interest_paid;
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$remaining_balance = $principal - $principal_paid;
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$this_year_interest_paid = $this_year_interest_paid + $interest_paid;
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$this_year_principal_paid = $this_year_principal_paid + $principal_paid;
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$var = !$var;
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print "<tr ".$bc[$var].">";
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print '<td align="right">' . $current_month . '</td>';
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print '<td align="right">' . number_format($interest_paid, "2", ".", ",") . ' ' . $langs->trans("Currency".$conf->currency) . '</td>';
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print '<td align="right">' . number_format($principal_paid, "2", ".", ",") . ' ' . $langs->trans("Currency".$conf->currency) . '</td>';
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print '<td align="right">' . number_format($remaining_balance, "2", ".", ",") . ' ' . $langs->trans("Currency".$conf->currency) . '</td>';
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print '</tr>';
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($current_month % 12) ? $show_legend = FALSE : $show_legend = TRUE;
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if ($show_legend) {
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print '<tr>';
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print '<td colspan="4"><b>' . $langs->trans("Totalsforyear") . ' ' . $current_year . '</td>';
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print '</tr>';
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$total_spent_this_year = $this_year_interest_paid + $this_year_principal_paid;
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print '<tr>';
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print '<td> </td>';
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print '<td colspan="3">';
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print 'You will spend ' . number_format($total_spent_this_year, "2", ".", ",") . ' ' . $langs->trans("Currency".$conf->currency) . ' on your house in year ' . $current_year . '<br>';
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print number_format($this_year_interest_paid, "2", ".", ",") . ' ' . $langs->trans("Currency".$conf->currency) . ' will go towards INTEREST<br>';
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print number_format($this_year_principal_paid, "2", ".", ",") . ' ' . $langs->trans("Currency".$conf->currency) . ' will go towards PRINCIPAL<br>';
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print '</td>';
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print '</tr>';
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print '<tr>';
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print '<td colspan="4"> <br></td>';
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print '</tr>';
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$current_year++;
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$this_year_interest_paid = 0;
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$this_year_principal_paid = 0;
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if (($current_month + 6) < $month_term)
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{
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echo $legend;
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}
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}
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$principal = $remaining_balance;
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$current_month++;
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}
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print "</table>\n";
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}
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llxFooter();
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$db->close();
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