currency conversion script

johnwayne77 · January 17, 2007

i am working at a currency conversion script.

here is the form code:
[code]<html>
<body>
<form id="form1" name="form1" method="get" action="jam.php">
<table width="64%" border="0" align="center" cellpadding="10" cellspacing="10">
<tr>
<td colspan="3"><div align="center">currency conversion </div></td>
</tr>
<tr>
<td><div align="center">
<label>
amount:
<input name="amount" type="text" id="amount" value="1" />
</label>
</div></td>
<td><div align="center">
<label>
from:
<select name="from" id="from">
<option value="EUR">EUR</option>
<option value="USD">USD</option>
<option value="RON">RON</option>
</select>
</label>
</div></td>
<td><div align="center">
to:
<select name="to" id="to">
<option value="EUR">EUR</option>
<option value="USD">USD</option>
<option value="RON">RON</option>
</select>
</div></td>
</tr>
<tr>
<td colspan="3"><div align="center">
<label>
<input type="submit" name="Submit" value="Submit" />
</label>
</div></td>
</tr>
</table>
</form>
</body>
</html>[/code]

and this is the php script code:

[code]<?php
$amount = $_GET["amount"];
$from = $_GET["from"];
$to = $_GET["to"];
$usd = file_get_contents("http://www.infovalutar.ro/azi/USD.bnr");
$eur = file_get_contents("http://www.infovalutar.ro/azi/EUR.bnr");
//$gbp = file_get_contents("http://www.infovalutar.ro/azi/GBP.bnr");
$ron = "1";
$usdat = "USD";
$eurat = "EUR";
//$gbpat = "GBP";
$ronat = "RON";
$ronusd = $ron / $usd; // 1 ron = ? usd
$roneur = $ron / $eur; // 1 ron = ? eur
$eurusd = $eur / $usd; // 1 euro = ? usd
$usdeur = $usd / $eur; // 1 usd = ? euro

if ( $to = $usdat ) {
if ( $from = $eurat ) {
$newamount = $amount * $eurusd;
echo $newamount;
}
else if ( $from = $usdat ) {
$newamount = $amount * 1;
echo $newamount;
}
else if ( $from = $ronat ) {
$newamount = $amount * $ronusd;
echo $newamount;
}}
else if ( $to = $eurat ) {
if ( $from = $usdat ) {
$newamount = $amount * $usdeur;
echo $newamount;
}
else if ( $from = $eurat ) {
$newamount = $amount * 1;
echo $newamount;
}
else if ( $from = $ronat ) {
$newamount = $amount * $roneur;
echo $newamount;
}}
else if ( $to = $ronat ) {
if ( $from = $usdat ) {
$newamount = $amount * $usd;
echo $newamount;
}
else if ( $from = $ronat ) {
$newamount = $amount * 1;
echo $newamount;
}
else if ( $from = $eurat ) {
$newamount = $amount * $eur;
echo $newamount;
}}
//echo $newamount;
//echo $usd;
?> [/code]

no matter what values i chose, it echoes me the result 1.29161917787 which is equal to '1.00 EUR = 1.29161917787 USD"

I don't understand why.

What am I missing?

Psycho · January 17, 2007

Well, I decided not to go through your code to find the error because all of it is totally unnecessary. To convert an amount from one rate to another you just need to multiple by (from_rate / to_rate). You could rewrite ALL of the PHP code above into just a few lines of code. I combined the form and processing pages into a single page for easy testing.

[code]<html>
<body>

<?php

if (isset($_GET['amount'])) {

$amount = $_GET["amount"];
$from = $_GET["from"];
$to = $_GET["to"];

$rate['RON'] = "1";
$rate['USD'] = file_get_contents("http://www.infovalutar.ro/azi/USD.bnr");
$rate['EUR'] = file_get_contents("http://www.infovalutar.ro/azi/EUR.bnr");
//$rate['GBP'] = "1"; = file_get_contents("http://www.infovalutar.ro/azi/GBP.bnr");

$newAmt = number_format( $amount * ($rate[$to]/$rate[$from]), 2 );
echo $amount ." (" . $from . ") = " . $newAmt . " (" . $to . ")<br><br>";
}

?>

<form id="form1" name="test" method="GET" action="<?=$PHP_SELF?>">
<table width="64%" border="0" align="center" cellpadding="10" cellspacing="10">
<tr>
<td colspan="3"><div align="center">currency conversion </div></td>
</tr>
<tr>
<td><div align="center">
<label>
amount:
<input name="amount" type="text" id="amount" value="<?=$amount?>" />
</label>
</div></td>
<td><div align="center">
<label>
from:
<select name="from" id="from">
<option value="EUR" <?php if ($from=="EUR") echo " SELECTED"; ?>>EUR</option>
<option value="USD" <?php if ($from=="USD") echo " SELECTED"; ?>>USD</option>
<option value="RON" <?php if ($from=="RON") echo " SELECTED"; ?>>RON</option>
</select>
</label>
</div></td>
<td><div align="center">
to:
<select name="to" id="to">
<option value="EUR" <?php if ($to=="EUR") echo " SELECTED"; ?>>EUR</option>
<option value="USD" <?php if ($to=="USD") echo " SELECTED"; ?>>USD</option>
<option value="RON" <?php if ($to=="RON") echo " SELECTED"; ?>>RON</option>
</select>
</div></td>
</tr>
<tr>
<td colspan="3"><div align="center">
<label>
<input type="submit" name="Submit" value="Submit" />
</label>
</div></td>
</tr>
</table>
</form>
</body>
</html>[/code]

Psycho · January 17, 2007

Ok, I see your error now. In all your IF statements you are using a single '=' to test. You need to use double equal signs, '==' - otherwise it is assinging the value to the variable.

johnwayne77 · January 17, 2007

sweeet!

i've tested both methods, it works just fine!

thank you very much dude!

thoma11 · April 10, 2007

Can u send me the full script of currency conversion script?

Psycho · April 10, 2007

[quote author=thoma11 link=topic=122846.msg571381#msg571381 date=1176244359]
Can u send me the full script of currency conversion script?
[/quote]

What do you think that is above? Just modify the code to handle whatever currencies you want assuming that the conversion rate is available from infovalutar.ro

thoma11 · April 10, 2007

I tried the exact code ..but when I submit the button showing "You are not authorised to access this resource"..
Anything more I have to do .?
I am new in php ..
Thanks..

Psycho · April 11, 2007

Odd, it works perfectly fine for me. Did you copy and paste all of the code from the 2nd post into a php file? Is your web server properly set up with access to the location of that file and is PHP enabled?

thoma11 · April 11, 2007

yes, I copied the 2nd one..
web server etc is correct ...
but this type of error...:)no idea...

thoma11 · April 11, 2007

When I tried to run from command prompt it showing undefined from and to in these lines..
<option value="EUR" <?php if ($from=="EUR") echo " SELECTED"; ?>>EUR</option>
and
<option value="EUR" <?php if ($to=="EUR") echo " SELECTED"; ?>>EUR</option>.
But I already defined
$from = $_GET["from"];
$to = $_GET["to"];
this one is right?

johnwayne77 · April 11, 2007

this is the whole php script (currency.php)

let me know if you need further assistance.

[code]<title>currency conversion v 1.0b by Ducoci</title>

<form id="form1" name="test" method="POST" action="<?=$PHP_SELF?>">
<p> </p>
<p align="center"> </p>
<table width="64%" border="1" align="center" cellpadding="10" cellspacing="10" bordercolor="#003366">
<tr bgcolor="#006666">
<td colspan="3" bgcolor="#006666"><div align="center"><font color="#FFFFFF"><strong>currency conversion</strong></font></div></td>
</tr>
<tr>
<td><div align="center">
<label>
amount:
<input name="amount" type="text" id="amount" value="<?=$amount?>" />
</label>
</div></td>
<td><div align="center">
<label>
from:
<select name="from" id="from">
<option value="EUR" <?php if ($from=="EUR") echo " SELECTED"; ?>>EUR</option>
<option value="USD" <?php if ($from=="USD") echo " SELECTED"; ?>>USD</option>
<option value="RON" <?php if ($from=="RON") echo " SELECTED"; ?>>RON</option>
<option value="GBP" <?php if ($from=="GBP") echo " SELECTED"; ?>>GBP</option>
<option value="XAU" <?php if ($from=="XAU") echo " SELECTED"; ?>>XAU</option>
<option value="XDR" <?php if ($from=="XDR") echo " SELECTED"; ?>>XDR</option>
<option value="MDL" <?php if ($from=="MDL") echo " SELECTED"; ?>>MDL</option>
<option value="CAD" <?php if ($from=="CAD") echo " SELECTED"; ?>>CAD</option>
<option value="AUD" <?php if ($from=="AUD") echo " SELECTED"; ?>>AUD</option>
</select>
</label>
</div></td>
<td><div align="center">
to:
<select name="to" id="to">
<option value="RON" <?php if ($to=="RON") echo " SELECTED"; ?>>RON</option>
<option value="USD" <?php if ($to=="USD") echo " SELECTED"; ?>>USD</option>
<option value="EUR" <?php if ($to=="EUR") echo " SELECTED"; ?>>EUR</option>
<option value="GBP" <?php if ($to=="GBP") echo " SELECTED"; ?>>GBP</option>
<option value="XAU" <?php if ($to=="XAU") echo " SELECTED"; ?>>XAU</option>
<option value="XDR" <?php if ($to=="XDR") echo " SELECTED"; ?>>XDR</option>
<option value="MDL" <?php if ($to=="MDL") echo " SELECTED"; ?>>MDL</option>
<option value="CAD" <?php if ($to=="CAD") echo " SELECTED"; ?>>CAD</option>
<option value="AUD" <?php if ($to=="AUD") echo " SELECTED"; ?>>AUD</option>
</select>
</div></td>
</tr>
<tr>
<td colspan="3"><div align="center">(currency rates updated daily according to BNR official exchange rates) <br />
<em><font size="2">[ XAU = gr. aur ; XDR = gr. argint ; MDL = leu moldovenesc ]</font></em> </div></td>
</tr>
<tr>
<td colspan="3"><div align="center">
<label>
<input type="submit" name="Submit" value="Convert" />
</label>
</div></td>
</tr>
</table>
<p>
<?php

if (isset($_POST['amount'])) {

$amount = $_POST["amount"];
$from = $_POST["from"];
$to = $_POST["to"];

$rate['RON'] = "1";
$rate['USD'] = file_get_contents("http://www.infovalutar.ro/azi/USD.bnr");
$rate['EUR'] = file_get_contents("http://www.infovalutar.ro/azi/EUR.bnr");
$rate['GBP'] = file_get_contents("http://www.infovalutar.ro/azi/GBP.bnr");
$rate['XAU'] = file_get_contents("http://www.infovalutar.ro/azi/XAU.bnr");
$rate['XDR'] = file_get_contents("http://www.infovalutar.ro/azi/XDR.bnr");
$rate['MDL'] = file_get_contents("http://www.infovalutar.ro/azi/MDL.bnr");
$rate['CAD'] = file_get_contents("http://www.infovalutar.ro/azi/CAD.bnr");
$rate['AUD'] = file_get_contents("http://www.infovalutar.ro/azi/AUD.bnr");
$newAmt = number_format( $amount * ($rate[$from]/$rate[$to]), 2 );
// $newAmt = number_format( $amount * ($rate[$to]/$rate[$from]), 2 );
// echo $amount ." (" . $from . ") = " . $newAmt . " (" . $to . ")<br><br>";

echo "</p>";
echo "<p> </p>";
echo "<hr align='center' width='70%'/>";
echo "<p> </p>";
echo "<table width='50%' border='1' align='center' cellpadding='10' cellspacing='10' bordercolor='#003399'>";
echo "<tr>";
echo "<td colspan='3' bgcolor='#CC3300'><div align='center'><font color='#FFFFFF'><strong>result</strong></font></div></td>";
echo "</tr>";
echo "<tr>";
echo "<td width='45%'><div align='center'>"; echo $amount ." (" . $from . ")"; echo "</div></td>";
echo "<td width='10%'><div align='center'> = </div></td>";
echo "<td width='45%'><div align='center'>"; echo $newAmt . " (" . $to . ")"; echo "</div></td>";
echo "</tr>";
echo "</table>";
echo "<p align='center'>  </p> ";
}
?>
</form>
</body>
</html>[/code]

Psycho · April 11, 2007

[quote author=thoma11 link=topic=122846.msg571664#msg571664 date=1176269808]
When I tried to run from command prompt it showing undefined from and to in these lines..
<option value="EUR" <?php if ($from=="EUR") echo " SELECTED"; ?>>EUR</option>
and
<option value="EUR" <?php if ($to=="EUR") echo " SELECTED"; ?>>EUR</option>.
But I already defined
$from = $_GET["from"];
$to = $_GET["to"];
this one is right?
[/quote]

I think this has something to do with you running it from a command prompt. because even if you didn't define those variables PHP wouldn't throw that error in that situation.

thoma11 · April 11, 2007

Hi When I tried to run Currency conversion script it's showing the follwing error.
Bad request: probably tried to POST a non-executable URL

I am using xitami server and saved in right path in web server ..
Any suggestion?
Thanks..

paul2463 · April 11, 2007

this might seem straight forward but did you save it in your server root as a PHP file not a HTML file??

johnwayne77 · April 16, 2007

maybe you should install apache..?

danlew · April 20, 2007

Script seems to work for me,

but what if i want to add more country currencies to this like the Thai Baht etc. how do i make extra currencies available in this script

johnwayne77 · April 20, 2007

I think you need to use the same algorithm.

As for more currencies, that depends on where you feed from the updated rates. It's all in the RSS

danlew · April 22, 2007

So at the moment its set to this;

$rate['RON'] = "1";
$rate['USD'] = file_get_contents("http://www.infovalutar.ro/azi/USD.bnr");
$rate['EUR'] = file_get_contents("http://www.infovalutar.ro/azi/EUR.bnr");
$rate['GBP'] = file_get_contents("http://www.infovalutar.ro/azi/GBP.bnr");
$rate['XAU'] = file_get_contents("http://www.infovalutar.ro/azi/XAU.bnr");
$rate['XDR'] = file_get_contents("http://www.infovalutar.ro/azi/XDR.bnr");
$rate['MDL'] = file_get_contents("http://www.infovalutar.ro/azi/MDL.bnr");
$rate['CAD'] = file_get_contents("http://www.infovalutar.ro/azi/CAD.bnr");
$rate['AUD'] = file_get_contents("http://www.infovalutar.ro/azi/AUD.bnr");

so what if i want it to read from lets say the bankgok bank curreny rates which are located here;
http://www.bangkokbank.com/Bangkok+Bank/Web+Services/Rates/FX+Rates.htm

How do i set this?

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currency conversion script

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