A simple currency converter that I wrote using PHP to convert currency from Philippine Peso, Canadian Dollar, Hongkong Dollar, and Japanese Yen vice versa.
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Program Listing
index.php
<?php
// Output text
$out = $ans = $txtAmount =
// txtSelectBox1 selection
$selA0 = $selA1 = $selA2 = $selA3 =
// txtSelectBox2 selection
$selB0 = $selB1 = $selB2 = $selB3 = "";
// Check if form was submitted
if(isset($_POST['txtSelectBox1'])) {
// Get post values
$txtSel1 = $_POST['txtSelectBox1'];
$txtSel2 = $_POST['txtSelectBox2'];
$txtAmount = $_POST['txtAmount'];
// Exchange rates
$cur = array("PHP", "CAD", "HKD", "JPY");
$php = array("1", "0.026219", "0.159988", "2.187584");
$cad = array("38.148506", "1", "6.104467", "83.556541");
$hkd = array("6.250537", "0.163831", "1", "13.689826");
$jpy = array("0.45631", "0.011967", "0.07302", "1");
// Switch statement for conversion
switch ($txtSel1) {
case "php":
$selA0 = ${"selB".$txtSel2} = "selected";
$ans = $txtAmount * floatval($php[$txtSel2]);
$case = 0;
break;
case "cad":
$selA1 = ${"selB".$txtSel2} = "selected";
$ans = $txtAmount * floatval($cad[$txtSel2]);
$case = 1;
break;
case "hkd":
$selA2 = ${"selB".$txtSel2} = "selected";
$ans = $txtAmount * floatval($hkd[$txtSel2]);
$case = 2;
break;
case "jpy":
$selA3 = ${"selB".$txtSel2} = "selected";
$ans = $txtAmount * floatval($jpy[$txtSel2]);
$case = 3;
break;
}
// Display output
$out = '<div class="answer">'.$txtAmount.' '.$cur[$case].' = '.$ans.' '.$cur[$txtSel2].'</div>';
}
?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Simple Currency Converter in PHP</title>
<link rel="stylesheet" href="style.css">
</head>
<body>
<main>
<div class="container">
<div class="title">
<h1>Simple Currency Converter in PHP</h1>
<h2>» Jake R. Pomperada, MAED-IT, MIT «</h2>
<i>Exchange Rates as of Feb 17, 2021</i>
</div>
<div class="container-wrapper">
<form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post" class="frmSelect" name="frm">
<div class="selectWrapper">
<select class="txtSelectBox" name="txtSelectBox1" id="txtSelectBox1">
<option value="php" <?php echo $selA0; ?>>Philippine Peso (PHP)</option>
<option value="cad" <?php echo $selA1; ?>>Canadian Dollar (CAD)</option>
<option value="hkd" <?php echo $selA2; ?>>Hong Kong Dollar (HKD)</option>
<option value="jpy" <?php echo $selA3; ?>>Japanese Yen (JPY)</option>
</select>
<select class="txtSelectBox" name="txtSelectBox2" id="txtSelectBox2">
<option value="0" <?php echo $selB0; ?>>Philippine Peso (PHP)</option>
<option value="1" <?php echo $selB1; ?>>Canadian Dollar (CAD)</option>
<option value="2" <?php echo $selB2; ?>>Hong Kong Dollar (HKD)</option>
<option value="3" <?php echo $selB3; ?>>Japanese Yen (JPY)</option>
</select>
</div>
<input type="number" class="txtbox" name="txtAmount" id="txtAmount" value="<?php echo $txtAmount; ?>" placeholder="Input Amount" required>
<div class="btnWrapper">
<a href="index.php" class="btn btnReset" name="btnReset">Reset</a>
<button type="submit" class="btn btnConvert" name="btnConvert">Convert</button>
</div>
<?php echo $out; ?>
</form>
</div>
</div>
</main>
</body>
</html>
style.css
* {
box-sizing: border-box;
}
body {
font-family: "Calibri", sans-serif;
background: #e2e1e0;
color: #111;
}
main {
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
}
.container {
padding: 50px;
width: 600px;
background: #fff;
text-align: left;
border-radius: 20px;
box-shadow: 0 0 60px rgba(0,0,0,0.05);
}
h1 {
margin: 0;
line-height: 0.9;
}
h2 {
margin: 0;
}
.title {
display: block;
margin: 0 0 30px;
text-align: center;
}
select,
.txtbox {
display: inline-block;
background: #f1f1f1;
width: 100%;
margin: 0 0 10px 0;
padding: 15px;
border: none;
font-size: 20px;
border-radius: 8px;
font-family: "Calibri", sans-serif;
}
.selectWrapper {
display: inline-flex;
margin: 0 0 10px 0;
}
.selectWrapper select {
width: 245px;
}
.selectWrapper select:first-child {
margin: 0 10px 0 0;
}
.selectWrapper select:last-child {
margin: 0;
}
select:hover,
select:focus,
.txtbox:hover,
.txtbox:focus {
background: #e0e0e0;
}
.btnWrapper {
display: inline-flex;
}
.btn {
background: #673ab7;
color: #fff;
padding: 15px;
width: 250px;
opacity: 0.9;
outline: none;
font-size: 20px;
text-transform: uppercase;
border: none;
text-decoration: none;
text-align: center;
font-family: "Calibri", sans-serif;
cursor: pointer;
text-decoration: none;
display: block;
}
.btn:hover {
opacity: 1;
}
.btnReset {
background: #ff5722;
border-radius: 8px 0 0 8px;
}
.btnConvert {
border-radius: 0 8px 8px 0;
}
.answer {
width: 100%;
padding: 20px;
text-align: center;
font-size: 25px;
font-weight: bold;
background: #9e9e9e;
color: #fff;
line-height: 1;
margin-top: 20px;
border-radius: 8px;
}
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