php 如何使用PHP获取输入字段值
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/13447554/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
How to get input field value using PHP
提问by nasty
I have a input field as follows:
我有一个输入字段，如下所示：
<input type="text" name="subject" id="subject" value="Car Loan">
I would like to get the input fields value Car Loanand assign it to a session. How do I do this using PHP or jQuery?
我想获取输入字段值Car Loan并将其分配给会话。如何使用 PHP 或 jQuery 执行此操作？
回答by Jeremy John
Use PHP's $_POSTor $_GETsuperglobals to retrieve the value of the input tag via the name of the HTML tag.
使用 PHP$_POST或$_GET超全局变量通过 HTML 标记的名称检索输入标记的值。
For Example, change the method in your form and then echo out the value by the name of the input:
例如，更改表单中的方法，然后按输入名称回显值：
Using $_GETmethod:
使用$_GET方法：
<form name="form" action="" method="get">
<input type="text" name="subject" id="subject" value="Car Loan">
</form>
To show the value:
要显示值：
<?php echo $_GET['subject']; ?>
Using $_POSTmethod:
使用$_POST方法：
<form name="form" action="" method="post">
<input type="text" name="subject" id="subject" value="Car Loan">
</form>
To show the value:
要显示值：
<?php echo $_POST['subject']; ?>
回答by Eric Leschinski
Example of using PHP to get a value from a form:
使用 PHP 从表单中获取值的示例：
Put this in foobar.php:
把它放在 foobar.php 中：
<html>
<body>
<form action="foobar_submit.php" method="post">
<input name="my_html_input_tag" value="PILLS HERE"/>
<input type="submit" name="my_form_submit_button"
value="Click here for penguins"/>
</form>
</body>
</html>
Read the above code so you understand what it is doing:
阅读上面的代码，以便您了解它在做什么：
"foobar.php is an HTML document containing an HTML form. When the user presses the submit button inside the form, the form's action property is run: foobar_submit.php. The form will be submitted as a POST request. Inside the form is an input tag with the name "my_html_input_tag". It's default value is "PILLS HERE". That causes a text box to appear with text: 'PILLS HERE' on the browser. To the right is a submit button, when you click it, the browser url changes to foobar_submit.phpand the below code is run.
“foobar.php 是一个包含 HTML 表单的 HTML 文档。当用户按下表单内的提交按钮时，表单的 action 属性运行：foobar_submit.php。表单将作为 POST 请求提交。表单内部是一个 input 标签，带有名称“my_html_input_tag”。它的默认值是“PILLS HERE”。这会导致在浏览器上出现一个带有文本的文本框：“PILLS HERE”。右侧是一个提交按钮，当您单击它时，浏览器网址会发生变化tofoobar_submit.php并运行以下代码。
Put this code in foobar_submit.php in the same directory as foobar.php:
将此代码放在与 foobar.php 相同的目录中的 foobar_submit.php 中：
<?php
echo $_POST['my_html_input_tag'];
echo "<br><br>";
print_r($_POST);
?>
Read the above code so you know what its doing:
阅读上面的代码，你就知道它在做什么：
The HTML form from above populated the $_POST superglobal with key/value pairs representing the html elements inside the form. The echo prints out the value by key: 'my_html_input_tag'. If the key is found, which it is, its value is returned: "PILLS HERE".
上面的 HTML 表单使用表示表单内 html 元素的键/值对填充 $_POST 超全局变量。echo 通过键打印出值：'my_html_input_tag'。如果找到了键，则返回其值：“PILLS HERE”。
Then print_r prints out all the keys and values from $_POST so you can peek as to what else is in there.
然后 print_r 打印出 $_POST 中的所有键和值，以便您可以查看其中还有什么。
The value of the input tag with name=my_html_input_tagwas put into the $_POST and you retrieved it inside another PHP file.
带有 name= 的输入标签的值my_html_input_tag被放入 $_POST 并且您在另一个 PHP 文件中检索它。
回答by Akhilraj N S
You can get the value $valueas :
您可以获得以下值$value：
$value = $_POST['subject'];
or:
或者：
$value = $_GET['subject'];,depending upon the form method used.
$value = $_GET['subject'];，取决于所使用的形式方法。
session_start();
$_SESSION['subject'] = $value;
the value is assigned to session variable subject.
该值被分配给会话变量主题。
回答by Somy A
For global use, you may use:
对于全球使用，您可以使用：
$val = $_REQUEST['subject'];
and to add yo your session, simply
并添加您的会话，只需
session_start();
$_SESSION['subject'] = $val;
And you dont need jQuery in this case.
在这种情况下你不需要 jQuery。
回答by Fee
If its a get request use, $_GET['subject']or if its a post request use, $_POST['subject']
如果是获取请求使用，$_GET['subject']或者是发布请求使用，$_POST['subject']
回答by bhaveshkac
function get_input_tags($html)
{
$post_data = array();
// a new dom object
$dom = new DomDocument;
//load the html into the object
$dom->loadHTML($html);
//discard white space
$dom->preserveWhiteSpace = false;
//all input tags as a list
$input_tags = $dom->getElementsByTagName('input');
//get all rows from the table
for ($i = 0; $i < $input_tags->length; $i++)
{
if( is_object($input_tags->item($i)) )
{
$name = $value = '';
$name_o = $input_tags->item($i)->attributes->getNamedItem('name');
if(is_object($name_o))
{
$name = $name_o->value;
$value_o = $input_tags->item($i)->attributes->getNamedItem('value');
if(is_object($value_o))
{
$value = $input_tags->item($i)->attributes->getNamedItem('value')->value;
}
$post_data[$name] = $value;
}
}
}
return $post_data;
}
error_reporting(~E_WARNING);
$html = file_get_contents("https://accounts.google.com/ServiceLoginAuth");
print_r(get_input_tags($html));
回答by Asep Nurjaman
<form action="" method="post">
<input type="text" name="subject" id="subject" value="Car Loan">
<button type="submit" name="ok">OK</button>
</form>
<?php
if(isset($_POST['ok'])){
echo $_POST['subject'];
}
?>
