提交表单将替换页面所需的常量GET信息 [英] Submitting form replaces constant GET information that is needed for the page

问题描述

我正在学习php，我必须说我到处都是google，但是我被困住了:(

I'm learning php and I've got to say I've googled everywhere and I'm stuck :(

换句话说，我的问题是如何将新变量添加到页面上的先前变量?

My question is, in other words, how can I get new variables added to previous variables on the page?

想象一下这是 www.mysite.com/getvartest.php?orgvar=12345

但提交此表格后，它将转到

but after submitting this form it'll go to

www.mysite.com/getvartest.php?varselection=selection1

我期望的是:

想象一下这是 www.mysite.com/getvartest.php?orgvar=12345&varselection=selection1

我该如何解决?

<p>Testing two ore more variables</p>

<form action="getvartest.php?orgvar=12345" method="get">
<select name="varselection">
<option value="selection1">selection1</option>
<option value="selection2">selection2</option>
</select>
<input type="submit" />
</form>

---

<?php
@$originalvar = $_GET['orgvar'];
@$varselection = $_GET['varselection'];

if($originalvar&&$varselection)
echo "Testing original variable $originalvar. Testing second passthrough variable through here: $varselection";


?>

推荐答案

使用部分隐藏的输入字段来保存值，而不是提交给带有部分查询字符串的 action URL您要修复的变量.看看是否可以让您的PHP脚本生成这样的表单:

Instead of submitting to an action URL with part of the query string already filled out, use a hidden input field to hold the values of the variables you want to be fixed. See if you can get your PHP script to generate a form like this:

<form action="getvartest.php" method="get">
  <input type="hidden" name="orgvar" value="12345" />
  <select name="varselection">
    <option value="selection1">selection1</option>
    <option value="selection2">selection2</option>
  </select>
  <input type="submit" />
</form>

也许是这样的:

<input type="hidden" name="orgvar" value="<?= htmlspecialchars($_GET['orgvar']) ?>" />

( htmlspecialchars()调用仅在其中转义< ，& 和"情况在 orgvar 中有这些.)

(The htmlspecialchars() call escapes characters like <, &, and " just in case there are any of these in orgvar.)

或者，如果您想保存每个查询参数，则可以使用通用循环，例如:

Or if you wanted to save every query parameter you could use a generic loop like:

<?php foreach ($_GET as $name => $value) { ?>
    <input type="hidden" name="<?= htmlspecialchars($name)  ?>"
                        value="<?= htmlspecialchars($value) ?>" /> 
<?php } ?>

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