What are the methods for obtaining form data in PHP?

PHP methods for obtaining form data are: 1. Use the predefined variable "$_GET" to obtain the data submitted by the GET method; 2. Use the predefined variable "$_POST" to obtain the data submitted by the POST method. Data; 3. Using the predefined variable "$_REQUEST", the data submitted by the GET and POST methods can be obtained.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

1. Use predefined variables$ _GET, can obtain the data submitted by the GET method (the form needs to be set to method="get")

During the development process of the program, the data submitted by the GET method is Sent attached to the URL, so information of the type "Parameters passed by the URL user" will be displayed in the address bar of the URL, as shown below:

http://url?name1=value1&name2=value2 ...

• name1, name2 is the name of the form element (set by the name attribute of the form element), value1 and value2 are the values ​​of the form element. The URL and form elements are separated by "?", and multiple form elements are separated by "&". The format of each form element is "name= value", fixed.
  

Let’s add the form of the user.html file and look at the address bar of the URL

##user. You can directly use the predefined variable

$_GET in the php file to obtain data. The $_GET global variable is an associative array. The key of the array is the value of the form element name, and the value of the array is the value of the corresponding form. (Note that all parameters in the URL can be obtained using $_GET.)

<?php
var_dump($_GET);
?>

You can use the

$_GET['key name'] method To get the value of each form element one by one:

<?php
header("content-type:text/html;charset=utf-8");
echo "用户名为：".$_GET['user']."<br>生日为：".$_GET['bday'];
?>

2. Use the predefined variable $_POST to get the data submitted by the POST method (required for the form form Set to method="post") The

post method does not depend on the URL and will not display the passed parameter value in the address bar.

$_POST The global variable is also an associative array. The key of the array is the value of the form element name, and the value of the array is the value of the corresponding form.

<?php
header("content-type:text/html;charset=utf-8");
echo "用户名为：".$_POST['user']."<br>生日为：".$_POST['bday'];
?>

3. Using the predefined variable $_REQUEST, the data submitted by the GET and POST methods can be obtained

$_REQUEST global The variable is an array containing $_POST, $_GET and $_COOKIE. The array structure is similar to $_POST and $_GET.

<?php
header("content-type:text/html;charset=utf-8");
var_dump($_REQUEST);
echo "用户名为：".$_REQUEST['user']."<br>生日为：".$_REQUEST['bday'];
?>

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