Javascript vs. php help

[Anon]

Hello,

Not being an expert at java script or php for that matter I am having a difficult time at what I am sure most would feel to be easy. I have found a short script that solves for i in a loan calculation. i being the interest rate given pmt, pv, and nper. If someone is so inclined could you help me convert it to php.

function findi(p,lasti,pmt,n)
{
var i = (pmt(1-Math.pow((1+lasti),-n)))/p;
return i;
}
function computei()
{
var h = document.LOANI;
var ppy = parseFloath.payperyr.value);
var p = parseFloat(h.princ.value);
var n = parseFloat(h.n.value);
var lasti = n;
var pmt = parseFloat(h.pmt.value);
var count = 0;
var i;
while ( 1 ) {
i = findi(p,lasti,pmt,n);
if ( ppy100Math.abs( lasti-i) < .0000001 ) break;
lasti = i;
count = count + 1;
if ( count > 500 ) break;
}
if ( count > 500 ) {
h.fint.value = "-";
h.count.value = "NoConvrgnc";
}
else {
h.fint.value=ippy*100;
h.count.value=count;
}
}

ie p=100000, n=180, pmt=955.67 should equal 8%

[Anon]

I'll tell you the PHP equivalents of those JavaScript functions:

Math.pow() is pow()
parseFloat() is floatval()
Math.abs() is abs()

The while loop, break statements, if statements, function definitions and return statements are the same.

Diego

[Anon]

Diego,

Thank you for your help. I assume I also have to change each of the variables to a $?

Is the same true for the function, ie: function payment(p,i,n,ppy) to function payment($p,$i,$n,$ppy)?

Thanks for your help

[Anon]

Yep.

e.g.

function ($a) {
print $a;
}

Diego

[Anon]

Diago,

Again I appreciate your help in answering these questions.

I have been working on the script with little luck. In trying to compare java script to php, is the following part of a class or object? (only thing I see in java script websites using a .)

var h = document.LOANI;
var ppy = parseFloath.payperyr.value);
var p = parseFloat(h.princ.value);
var n = parseFloat(h.n.value);
var lasti = n;
var pmt = parseFloat(h.pmt.value);

If so can you give me a hint on how to use in php?

Thanks

jb