php - 如何循环基于每月或每周的贷款摊销日期范围

Question

我正在制定贷款分期偿还计划，需要日期循环的帮助。我已经能够获得付款时间表，但需要有关包含日期的帮助。请帮我处理日期循环。谢谢

echo '<table border="1">';
echo '<tr><th>#</th><th>PAYMENT</th><th>INTEREST</th><th>PRINCIPAL</th><th>BALANCE</th></tr>';
$start_date = '2014-12-14';
$end_date = '2015-03-12';
$count = 0;
do {
   $count++;

   // calculate interest on outstanding balance
   $interest = $balance * $rate/100;

   // what portion of payment applies to principal?
   $principal = $payment - $interest;

   // watch out for balance < payment
   if ($balance < $payment) {
      $principal = $balance;
      $payment   = $interest + $principal;
   } // if

   // reduce balance by principal paid
   $balance = $balance - $principal;

   // watch for rounding error that leaves a tiny balance
   if ($balance < 0) {
      $principal = $principal + $balance;
      $interest  = $interest - $balance;
      $balance   = 0;
   } // if

   echo "<tr>";
   echo "<td>$count</td>";
   echo "<td>" .number_format($payment,   2, ".", ",") ."</td>";
   echo "<td>" .number_format($interest,  2, ".", ",") ."</td>";
   echo "<td>" .number_format($principal, 2, ".", ",") ."</td>";
   echo "<td>" .number_format($balance,   2, ".", ",") ."</td>";
   echo "</tr>";

   @$totPayment   = $totPayment + $payment;
   @$totInterest  = $totInterest + $interest;
   @$totPrincipal = $totPrincipal + $principal;

   if ($payment < $interest) {
      echo "</table>";
      echo "<p>Payment < Interest amount - rate is too high, or payment is too low</p>";
      exit;
   } // if

} while ($balance > 0);

echo "<tr>";
echo "<td>&nbsp;</td>";
echo "<td><b>" .number_format($totPayment,   2, ".", ",") ."</b></td>";
echo "<td><b>" .number_format($totInterest,  2, ".", ",") ."</b></td>";
echo "<td><b>" .number_format($totPrincipal, 2, ".", ",") ."</b></td>";
echo "<td>&nbsp;</td>";
echo "</tr>";
echo "</table>";

谢谢

Answer 1

$timestampInOneWeek = strtotime('+1 week');
$timestampOneMonthAfter01january = strtotime('+1 month', 1419984000);

您还可以使用 DateTime::add

$month_later = new DateTime('2000-01-01');
$month_later->add(new DateInterval('P1M'));