02c04-3.php

来自「介绍PHP5的给类型函数应用」· PHP 代码 · 共 50 行

<?php
ob_start();
require '02c04-1.php';
ob_end_clean();

// Let's calculate and output a table of values showing a monthly balance 
//  of a credit card assuming we start with a $5000 debt, have a 9.2% rate,
//  it is compounded monthly, and we make $200 payments a month
$value = 5000;
$rate = .092;
$payment = 200;

// Begin our output:
echo "<style>td { border: 1px solid black; }</style>
<table><tr><th>Month</th><th>Initial Value</th><th>Interest</th>
<th>Payment</th><th>End of Month Balance</th>
<th>Cumulative Payments Made</th></tr>\n";

// Until the value is 0 or less, loop:
$month = 1;
$cumulative = 0;
while ($value > 0) {
    // Calculate the interest that would be applied this month:
    $interest = calc_simple_interest($value, $rate, 1/12);
    
    // Calculate the new principal
    $newvalue = $value + $interest;
    
    // Determine if the payment would be too much, and adjust accordingly:
    $payment = ($payment > $newvalue) ? $newvalue : $payment;
    
    // Add up the cumulative payments made:
    $cumulative += $payment;

    // Now determine the final value:
    $finalvalue = $newvalue - $payment;    
    
    // Echo out the values:
    echo '<tr><td>', $month++, "</td><td>{$value}</td><td>{$interest}</td>
<td>{$payment}</td><td>{$finalvalue}</td><td>{$cumulative}</td></tr>\n";
    
    // Now reset the value to this month's end, and repeat:
    $value = $finalvalue;
}

// Finish up our display, and exit ... This will end up displaying a table
//  showing that it will take 28 months to pay this debt off, and that you
//  will end up paying $5572.15 in total.
echo '</table>';
?>