如何在表单提交时保留已设置的 GET 参数值?

How to keep already-set GET parameter values on form submission?(如何在表单提交时保留已设置的 GET 参数值?)

问题描述

我有一个 URL:foo.php?name=adam&lName=scott，在 foo.php 中我有一个表单，它给了我 矩形长度 &rectangleBreadth 带有提交按钮.

I have a URL : foo.php?name=adam&lName=scott, and in foo.php I have a form which gives me values of rectangleLength & rectangleBreadth with a submit button.

当我点击表单操作为 $_SERVER['REQUEST_URI'] 的提交按钮时，我得到这个结果 URL:foo.php?rectangleLength=10&rectangleBreadth=5代码>(这些值已由用户填写).

When I click this submit button with form action as $_SERVER['REQUEST_URI'], I get this result URL: foo.php?rectangleLength=10&rectangleBreadth=5 (these values have been filled in by the user).

请注意，我丢失了以前的值 name &lName 来自 URL.

Notice that I am losing my previous values name & lName from the URL.

我怎样才能保留它们?

另外，请记住，我必须回到 foo.php，如果用户想再次提交表单，那么长度和宽度值应该改变.

Also, keep in mind that I have to come back to foo.php and if the user wants to submit the form again then the length and breadth values should change.

推荐答案

您可以在第一个目标站点的表单中添加两个隐藏字段，在您的情况下为 blabla.php:

You can add two hidden fields in the form on the first target site, blabla.php in your case:

<form ...>
  <input type="hidden" name="name" value="<?php echo htmlspecialchars($_GET['name']);?>">
  <input type="hidden" name="lName" value="<?php echo htmlspecialchars($_GET['lName']);?>">

  <!-- rest of the form here -->
</form>

对于动态解决方案，请使用 foreach 循环:

For a dynamic solution, use a foreach loop:

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

您可以考虑将动态方法锁定到已知可能键的列表:

You may consider locking the dynamic approach down to a list of known possible keys:

<?php
$keys = array('name', 'lName', ...);
foreach($keys as $name) {
  if(!isset($_GET[$name])) {
    continue;
  }
  $value = htmlspecialchars($_GET[$name]);
  $name = htmlspecialchars($name);
  echo '<input type="hidden" name="'. $name .'" value="'. $value .'">';
}
?>

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