douhan4093 2015-09-29 23:45
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如何得到回声返回方程式? [重复]

I am trying to create a small form which adds certain amounts from an html form The code is found below

HTML Page-->

<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content ="width=device-width,initial-scale=1,user scalable=yes" />
<title>NMAWS Form</title>
<style type="text/css">
div#container
{
   width: 800px;
   position: relative;
   margin-top: 0px;
   margin-left: auto;
   margin-right: auto;
   text-align: left;
}
</style>
<style type="text/css">
body
{
   text-align: center;
   margin: 0;
   background-color: #FFFFFF;
   color: #000000;
}
</style>

</head>
<body>
<form method="post" attribute="post" action="calcsubmit.php">
<br>
<b>Name:<br>
<input type="text" id="name" name="name"><br><br>
Email:<br>
<input type="text" id="email" name="email"><br><br>
Cell Number:<br>
<input type="text" id="cell" name="cell"><br>

<p>Number of people in home:<br/>
<select name="occupants" id="occupants" style="width:100px"><option value="1">1</option><option value="2">2</option><option value="3">3</option><option value="4">4</option>  <option value="5">5</option>  <option value="6">6</option>  <option value="7">7</option>  <option value="8">8</option>  <option value="9">9</option><option value="10">10</option></select></p>

<p>How much do you spend on<br>bottled water each week?<br/>
<select name="water" id="water" style="width:100px"><option value="5">$0 to $5</option><option value="10">$5 to $10</option><option value="15">$10 to $15</option><option value="20">$15 to $20</option><option value="25">$20 to $25</option></select></p>

<p>How many loads of laundry<br>do you do each week?<br/>
<select name="laundry" id="laundry" style="width:100px"><option value="1">1</option><option value="2">2</option><option value="3">3</option>    <option value="4">4</option>  <option value="5">5</option>  <option value="6">6</option>  <option value="7">7</option>  <option value="8">8</option>  <option value="9">9</option><option value="10">10</option></select></p>

<p></p>
<button type="submit" name="answer" id="answer" value="answer" style="width:100px; height:100px;"><font size='4'>Calculate Savings</font></button>
</form>
</body>
</html>

PHP page--->

<html>
<head>
<meta charset="utf-8">
<title>Savings</title>
</head>
<body>
<p>Savings are: 
<?php
if($_POST["answer"])
{
echo "$water + $laundry + $occupants";
}
?>
</p> 
</body>
</html>

The result is always + +, the php isnt even attempting to do the equation I am really not seeing what is wrong here

</div>
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3条回答 默认 最新

  • doumaji6215 2015-09-29 23:49
    关注

    Specifically on your question. To get the sum of values. You need to lose the quotes

    echo $water + $laundry + $occupants;
    

    Now, overall. There are a few points i'd like to mention. You are using $_POST, so on your secondary page. You need to reference the array by:

    echo $_POST['water'] + $_POST['laundry'] + $_POST['occupants']; 
    

    Second:

    I would not use if ($_POST['answer']). Instead i'd:

    if (isset($_POST)){ 
    
    echo $_POST['water'] + $_POST['laundry'] + $_POST['occupants'];
    
    }
    
    评论

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