我想做货币转换器。
$number1="";
$number3="";
<form method="POST">
<select id="dc1" name="dc1">
<option value="9777.31">SGD</option>
</select>
<input type="text" name="text1" value="<?php echo $nilai1?>">
<select id="dc2" name="dc2">
<option value="13190" >USD</option>
<input type="submit" name="calculate" value="calculate">
</select>
</form>
<?php
if(isset($_POST['calculate']))
{
if($_POST['dc1'] && $_POST['dc2'])
{
$number1 = $_POST['text1'];
$one = $_POST['dc1'];
$two = $_POST['dc2'];
$x = $number1 / ($two/$one);
$number3 = $x;
}else{
$number3 = "fail";
}
}
?>
<input type="text" name="text2" value="<?php echo $number3?>">
这些代码没问题，但是当我尝试像这样更改时？
$number1="";
$number3="";
$test=9777.31;
<form method="POST">
<select id="dc1" name="dc1">
<option value="<?php $test?>">SGD</option>
</select>
$number3结果是"fail"，我的代码这么糟糕吗？ 还是我忘记了什么？
试试这个：
$number1="";
$number3="";
$test=9777.31;
<form method="POST">
<select id="dc1" name="dc1">
<option value="<?php echo $test?>">SGD</option>
</select>