79 lines
2.4 KiB
PHP
Executable File
79 lines
2.4 KiB
PHP
Executable File
<?php
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/* A simple function to calculate 'interest on interest' together with
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a simple usage of the function.
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Copyright 2014 - Jack-Benny Persson <jack-benny@cyberinfo.se>
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Released under GNU GPL v.2 */
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function InteOnInte($amount, $interest, $year=1)
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{
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$totalAmount = pow($interest / 100 + 1, $year) * $amount;
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return $totalAmount;
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}
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function CLI_Usage()
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{
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print "Usage: php interest.php {amount to start with} {interest} [years]\n";
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print "Example: php interest.php 50000 3 10\n\n";
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print "Copyright 2014 - Jack-Benny Persson <jack-benny@cyberinfo.se>\n";
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}
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// If we are running from the terminal
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if (!array_key_exists("HTTP_USER_AGENT", $_SERVER))
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{
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// Sanity check
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if (!isset($argv[1]) || !isset($argv[2]))
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{
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print "Please enter amount and interest!\n";
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CLI_Usage();
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exit(1);
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}
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// Declare some variables
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$money = $argv[1];
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$inter = $argv[2];
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// If the user entered years
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if (isset($argv[3]))
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{
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$years = $argv[3];
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$mySavings = InteOnInte($money, $inter, $years);
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printf ("After %d years with %.2f%% interest on %.2f you will have " .
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"%.2f\n", $years, $inter, $money, $mySavings);
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}
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// If the user did not enter years
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else
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{
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$mySavings = InteOnInte($money, $inter);
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printf ("After 1 year with %.2f%% interest on %.2f you will have " .
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"%.2f\n", $inter, $money, $mySavings);
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}
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}
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// If we are running from a browser
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else
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{
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print ("<!DOCTYPE html>\n" .
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"<html>\n<head><title>Intereset On Interest</title></head>\n<body>" .
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"<h1>Interest On Interest calculator</h1>\n" .
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"<form method=\"GET\" action=\"$_SERVER[PHP_SELF]\">\n" .
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"Money: <input type=\"text\" name=\"money\"><br />\n" .
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"Interest: <input type=\"text\" name=\"interest\"><br />\n" .
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"Years:<input type=\"text\" name=\"years\"><br />\n" .
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"<input type=\"submit\" value=\"Calculate\">\n" .
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"</form>\n<br />\n");
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if (array_key_exists("money", $_GET) && array_key_exists("interest", $_GET)
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&& array_key_exists("years", $_GET))
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{
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print ("After $_GET[years] years with $_GET[interest]% interest on " .
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"$_GET[money] you will have ");
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$savings = InteOnInte($_GET['money'], $_GET['interest'], $_GET['years']);
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printf ("%.2f\n", $savings);
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}
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print "</body>\n</html>\n";
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}
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?>
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