我是PHP的新手，所以我不确定我做错了什么，但似乎只有句号才能执行，无论我选择哪种货币，都是美元兑换美元。
我需要这样做才能转换我选择的FROM和TO货币，转换会显示在amount_output框中。而且我输入的货币和挂载仍保留在结果中而不会被重置。
非常感谢任何帮助。
<?php
$amount_input = filter_input(INPUT_POST, 'amount_input');
$currency1 = filter_input(INPUT_POST, 'currency1');
$currency2 = filter_input(INPUT_POST, 'currency2');
if ($currency1="CAD" AND $currency2="CAD")
{
$amount_output = $amount_input*1.0;
}
if ($currency1="CAD" AND $currency2="EUR")
{
$amount_output = $amount_input*0.624514066;
}
if ($currency1="CAD" AND $currency2="GBP")
{
$amount_output = $amount_input*0.588714763;
}
if ($currency1="CAD" AND $currency2="USD")
{
$amount_output = $amount_input*0.810307;
}
if ($currency1="EUR" AND $currency2="CAD")
{
$amount_output = $amount_input*1.601244959;
}
if ($currency1="EUR" AND $currency2="EUR")
{
$amount_output = $amount_input*1.0;
}
if ($currency1="EUR" AND $currency2="GBP")
{
$amount_output = $amount_input*0.942676548;
}
if ($currency1="EUR" AND $currency2="USD")
{
$amount_output = $amount_input*1.2975;
}
if ($currency1="GBP" AND $currency2="CAD")
{
$amount_output = $amount_input*1.698615463;
}
if ($currency1="GBP" AND $currency2="EUR")
{
$amount_output = $amount_input*1.060809248;
}
if ($currency1="GBP" AND $currency2="GBP")
{
$amount_output = $amount_input*1.0;
}
if ($currency1="GBP" AND $currency2="USD")
{
$amount_output = $amount_input*1.3764;
}
if ($currency1="USD" AND $currency2="CAD")
{
$amount_output = $amount_input*1.234100162;
}
if ($currency1="USD" AND $currency2="EUR")
{
$amount_output = $amount_input*0.772200772;
}
if ($currency1="USD" AND $currency2="GBP")
{
$amount_output = $amount_input*0.726532984;
}
if ($currency1="USD" AND $currency2="USD")
{
$amount_output = $amount_input*1.0;
}
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<!--
To change this license header, choose License Headers in Project Properties.
To change this template file, choose Tools | Templates
and open the template in the editor.
-->
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>F/X Calculator</title>
<link href="fxCalcStyles.css" rel="stylesheet" type="text/css" />
</head>
<body>
<h1>Money Banks F/X Calculator</h1>
<hr></hr>
<form action="fxCalc.php" method="post">
<select name="currency1">
<option value="CAD">CAD</option>
<option value="EUR">EUR</option>
<option value="GBP">GBP</option>
<option value="USD">USD</option>
</select>
<input name="amount_input" type="text"/>
<select name="currency2">
<option value="CAD">CAD</option>
<option value="EUR">EUR</option>
<option value="GBP">GBP</option>
<option value="USD">USD</option>
</select>
<input name="amount_output" type="text" value="<?php echo $amount_output ?>" readonly="readonly"/>
<br />
<input type="submit" name="submit" value="Convert"></input>
<input type="reset" name="reset" value="Reset"></input>
</form>
</body>
</html>
答案 0 :(得分：7)
由于您是PHP的新手，我不是要向您展示货币转换器的复杂方法。现在，您需要学习基础知识，不应该专注于使用高级策略使您的代码简洁。您的代码很好，如果进行了两次调整，它将完美运行：
==（比较运算符）代替=（赋值运算符）。if/else if/else结构而不是一系列脱节的if结构。现在您的代码变为：
<?php
$amount_input = filter_input(INPUT_POST, 'amount_input');
$currency1 = filter_input(INPUT_POST, 'currency1');
$currency2 = filter_input(INPUT_POST, 'currency2');
if ($currency1 == "CAD" AND $currency2 == "CAD")
{
$amount_output = $amount_input*1.0;
}
else if ($currency1 == "CAD" AND $currency2 == "EUR")
{
$amount_output = $amount_input*0.624514066;
}
else if ($currency1 == "CAD" AND $currency2 == "GBP")
{
$amount_output = $amount_input*0.588714763;
}
else if ($currency1 == "CAD" AND $currency2 == "USD")
{
$amount_output = $amount_input*0.810307;
}
else if ($currency1 == "EUR" AND $currency2 == "CAD")
{
$amount_output = $amount_input*1.601244959;
}
else if ($currency1 == "EUR" AND $currency2 == "EUR")
{
$amount_output = $amount_input*1.0;
}
else if ($currency1 == "EUR" AND $currency2 == "GBP")
{
$amount_output = $amount_input*0.942676548;
}
else if ($currency1 == "EUR" AND $currency2 == "USD")
{
$amount_output = $amount_input*1.2975;
}
else if ($currency1 == "GBP" AND $currency2 == "CAD")
{
$amount_output = $amount_input*1.698615463;
}
else if ($currency1 == "GBP" AND $currency2 == "EUR")
{
$amount_output = $amount_input*1.060809248;
}
else if ($currency1 == "GBP" AND $currency2 == "GBP")
{
$amount_output = $amount_input*1.0;
}
else if ($currency1 == "GBP" AND $currency2 == "USD")
{
$amount_output = $amount_input*1.3764;
}
else if ($currency1 == "USD" AND $currency2 == "CAD")
{
$amount_output = $amount_input*1.234100162;
}
else if ($currency1 == "USD" AND $currency2 == "EUR")
{
$amount_output = $amount_input*0.772200772;
}
else if ($currency1 == "USD" AND $currency2 == "GBP")
{
$amount_output = $amount_input*0.726532984;
}
else if ($currency1 == "USD" AND $currency2 == "USD")
{
$amount_output = $amount_input*1.0;
}
?>
快乐的编码！
答案 1 :(得分：1)
您的脚本使用数组看起来会更容易，并且您不会遇到如此多的指令问题：
<?php
$amount_input = filter_input(INPUT_POST, 'amount_input');
$currency1 = filter_input(INPUT_POST, 'currency1');
$currency2 = filter_input(INPUT_POST, 'currency2');
$currencies = array();
$currencies['CAD'] = array(
'CAD' => 1,
'EUR' => 0.624514066,
'GBP' => 0.588714763,
'USD' => 0.810307
);
$amount_output = $amount_input*$currencies[$currency1][$currency2];
?>
答案 2 :(得分：0)
这将更容易维持，以美元为基础的所有货币，然后执行以下操作：
$currency1 = filter_input(INPUT_POST, 'currency1');
$currency2 = filter_input(INPUT_POST, 'currency2');
$amount_input = filter_input(INPUT_POST, 'amount_input');
$currencies = array(
'USD' => 1,
'CAD' => 1.234100162,
'EUR' => 0.772200772,
'GDP' => 0.726532984
);
$amount_output = ($amount_input/$currencies[$currency1])*$currencies[$currency2];