在$ _POST中找不到输入类型=图片值 [英] Can't find an input type=image value in $_POST

问题描述

好的可能是简单的问题，但：

我想通过点击图片来排序数字。

 < form id =form1name =form1method我认为我创建了一个表单并添加了一个imagefield。 =postaction =index.php> 
< input name =buyukatype =imagesrc =resimler / azalt.gif/> 
< / form> 
  

然后我会写这些代码。

  $ sorgu ='SELECT * FROM urunler'; 
 
 if（isset（$ _ POST ['buyuka']）
 
 {
 $ sorgu ='SELECT * FROM urunler ORDER BY uyeno DESC'; 
} 
 
 $ sonuclar = mysql_query（$ sorgu）; 
  

当我尝试添加提交按钮为了添加imagefield，它的工作原理。所以这意味着我犯了一个非常基本的错误，但我无法找到它。

：）

编辑---已解决

实际上，正如帕斯卡尔马丁说的那样：

p>

  if（isset（$ _ POST ['buyuka_x']，$ _POST ['buyuka_y']））
 {
 $ sorgu ='选择*从urunler ORDER BY uyeno DESC'; 
} 
  

它必须是这样的。感谢：）

noreferrer> var_dump（） 查看 $ _ POST中的内容：

  var_dump（$ _ POST）; 
  

你会发现，当你的表单使用< ;输入类型=图像> ，你会得到：

$ p $ array
' buyuka_x'=>字符串'0'（长度= 1）
'buyuka_y'=>字符串'0'（长度= 1）


所以，没有 $ b

• code $ $ POST ['buyuka_x']


• 和 $ _ POST ['buyuka_y']

这意味着你的代码看起来应该像这样（不是测试不存在的 buyuka code>条目，并测试两个 _x 和 _y - 我想测试其中一个这些应该足够了）：

  if（isset（$ _ POST ['buyuka_x']，$ _POST ['' buyuka_y']））
 {
 $ sorgu ='选择*来自urunler ORDER BY uyeno DESC'; 
} 
  



< hr>



在评论之后进行编辑：我不知道为什么 那样 - 但是有一个 .x 和 .y 是HTML标准中的定义。

如果您查看 HTML文档中的表单，然后向下滚动一下，就可以阅读：

当指针设备用于
点击图片，表单是
提交的，点击坐标
传递给服务器。
x值
是以图像
左边的像素和图像顶部的像素
的y值来度量的。

提交的数据包括
name.x = x-value 和 name.y = y-value
其中name是名称
属性的值，x值和y值是
x和y坐标值，$​​ b $ b 。

在PHP中，参数名称中的点自动被替换为和unerscore。


So：

• name.x 变成 name_x


• 和 name.y 变成 name_y

作为最后一条语句的源代码，您可以读取变量 来自外部来源 - HTML表单（GET和POST） （引用）：

变量名称中的点和空格是
转换为下划线。
对于
示例< input name =ab/> 变为
$ _ REQUEST [a_b ] 。

Well may be it is to easy question but:

I want to sort the numbers by clicking an image. I thought that i make a form and add an imagefield.

<form id="form1" name="form1" method="post" action="index.php">
<input name="buyuka" type="image" src="resimler/azalt.gif" />
</form>

Then i will write these codes.

$sorgu='SELECT * FROM urunler';

if(isset($_POST['buyuka'])

{
    $sorgu='SELECT * FROM urunler ORDER BY uyeno DESC';
}

$sonuclar=mysql_query($sorgu);

However it doesn't sort. When i try adding submit button in order to add imagefield, it works. So it means i make a really basic mistake but i cant find it.

Thank you for helping. :)

EDIT --- Solved

Actually as Pascal Martin said:

if(isset($_POST['buyuka_x'], $_POST['buyuka_y']))
{
    $sorgu='SELECT * FROM urunler ORDER BY uyeno DESC';
}

It must be like that. Thanks :)

解决方案

Just use var_dump() to see what's in $_POST :

var_dump($_POST);

And you'll see that, when your form is submitted using the <input type="image">, you get :

array
  'buyuka_x' => string '0' (length=1)
  'buyuka_y' => string '0' (length=1)

So, there is no $_POST['buyuka'] -- instead, there are :

• $_POST['buyuka_x']
• and $_POST['buyuka_y']

Which means your code should look like this (not testing for the unexistant buyuka entry, and testing for the two _x and _y -- I suppose that testing for one of those should be enough) :

if(isset($_POST['buyuka_x'], $_POST['buyuka_y']))
{
    $sorgu='SELECT * FROM urunler ORDER BY uyeno DESC';
}

---

Edit after the comments : I have no idea why it goes like that -- but having a .x and a .y is how it's defined in the HTML standard.

If you take a look at Forms in HTML documents, and scroll down a little, you'll be able to read :

When a pointing device is used to click on the image, the form is submitted and the click coordinates passed to the server.
The x value is measured in pixels from the left of the image, and the y value in pixels from the top of the image.
The submitted data includes name.x=x-value and name.y=y-value where "name" is the value of the name attribute, and x-value and y-value are the x and y coordinate values, respectively.

In PHP, the dots in parameters names are automatically replaced by and unerscore.
So :

• name.x becomes name_x
• and name.y becomes name_y

As a source for that last statement, you can read Variables From External Sources - HTML Forms (GET and POST) (quoting) :

Dots and spaces in variable names are converted to underscores.
For example <input name="a.b" /> becomes $_REQUEST["a_b"].

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