[SOLVED] Mortgage Calculator Function HELP

[SilentQ-noob-]

Hi,

 

I'm still pretty new to functions and haven't used them much. I wanted to make a function that takes user input data and calculates a monthly payment for a mortgage. I'm not sure if the actual syntax is wrong, or if it just comes down to the math- but its not working.

this is the form:

 

page1.php

<form action="mortgage_calculate.php" name"MortgageCalculator">
<table border="0" width="400">
<caption> Mortgage Calculator </caption>
<tr><td>List Price: <input type="text" value="listprice" /></td></tr>
<tr><td>Rate: <input type="text" value="rate" /> %</td></tr>
<tr><td>Downpayment: <input type="text" value="downpayment" /></td></tr>
<tr><td>Years: <input type="text" value="25" /></td></tr>
<tr><td><input type="submit" name="submit" value="Calculate" /></td></tr>
</table>
</form>

 

This is the actual PHP

 

mortgage_calculate.php

<?
$listprice=$_POST['listprice'];
$rate=$_POST['rate'];
$downpayment=$_POST['downpayment'];
$years=$_POST['years'];

function MortgageCalculator ($listprice, $rate, $downpayment, $years) {
$monthly= (($listprice - $downpayment) * $rate ) / ($years * 12 );
return $monthly;

}

print "Your Monthly Payments Should be Approximately: ";
print Mortgagecalculator($listprice, $rate, $downpayment, $years)



?>
<p>
Click <a href="page1.php">HERE</a> to go back to the calculator.

 

Regardless of user input- it always calculates to zero, or most likely doesn't calculate at all once the "Calculate" button is hit. ANY help would be greatly appreciated. THANKS!

[Adam1239]

<form action="mortgage_calculate.php" name"MortgageCalculator">

<table border="0" width="400">

<caption> Mortgage Calculator </caption>

<tr><td>List Price: <input type="text" name="listprice" value="listprice" /></td></tr>

<tr><td>Rate: <input type="text" name="rate" value="rate" /> %</td></tr>

<tr><td>Downpayment: <input type="text" value="downpayment" /></td></tr>

<tr><td>Years: <input type="text" name="years" value="25" /></td></tr>

<tr><td><input type="submit" name="submit" value="Calculate" /></td></tr>

</table>

</form>

 

it could be just your form not having the names.

[Adam1239]

<form action="mortgage_calculate.php" name"MortgageCalculator">

<table border="0" width="400">

<caption> Mortgage Calculator </caption>

<tr><td>List Price: <input type="text" name="listprice" value="listprice" /></td></tr>

<tr><td>Rate: <input type="text" name="rate" value="rate" /> %</td></tr>

<tr><td>Downpayment: <input type="text" value="downpayment" /></td></tr>

<tr><td>Years: <input type="text" name="years" value="25" /></td></tr>

<tr><td><input type="submit" name="submit" value="Calculate" /></td></tr>

</table>

</form>

 

it could be just your form not having the names.

 

sorry

 

<form action="mortgage_calculate.php" name"MortgageCalculator">
<table border="0" width="400">
<caption> Mortgage Calculator </caption>
<tr><td>List Price: <input type="text" name="listprice" value="listprice" /></td></tr>
<tr><td>Rate: <input type="text" name="rate" value="rate" /> %</td></tr>
<tr><td>Downpayment: <input type="text" name="downpayment" value="downpayment" /></td></tr>
<tr><td>Years: <input type="text" name="years" value="25" /></td></tr>
<tr><td><input type="submit" name="submit" value="Calculate" /></td></tr>
</table>
</form>

[Adam1239]

PHP:

<?
if($_POST['submit'])
{
$listprice=$_POST['listprice'];
$rate=$_POST['rate'];
$downpayment=$_POST['downpayment'];
$years=$_POST['years'];
  print "Your Monthly Payments Should be Approximately: ";
  print Mortgagecalculator($listprice, $rate, $downpayment, $years);
  print "<br />Click <a href=\"page1.php\">HERE</a> to go back to the calculator.";
}


function MortgageCalculator($listprice, $rate, $downpayment, $years) 
{
$monthly = (($listprice - $downpayment) * $rate ) / ($years * 12 );
return $monthly;
}
?>

 

FORM:

<form action="" method="POST">
<table border="0" width="400">
<caption> Mortgage Calculator </caption>
<tr><td>List Price: <input type="text" name="listprice" value="listprice" /></td></tr>
<tr><td>Rate: <input type="text" name="rate" value="rate" /> %</td></tr>
<tr><td>Downpayment: <input type="text" name="downpayment" value="downpayment" /></td></tr>
<tr><td>Years: <input type="text" name="years" value="25" /></td></tr>
<tr><td><input type="submit" name="submit" value="Calculate" /></td></tr>
</table>
</form>

 

Forget about the last 2 and try this one, if this is not what your looking for then you should play with the math abit but this should work.

[MadTechie]

@Adam1239, you can EDIT your last post.. you don't need to post over and over!

[Adam1239]

Also you will need to do a few checks on the inputs like is_numeric() etc because right now a user can enter eny letter/number they want and it may make it throw up errors with the function doing a calculation..

[Adam1239]

Thank you MadTechie, i'll keep that in mind next time 

[SilentQ-noob-]

Thanks for the help!