How to transfer data between different pages in php

In PHP development, we often need to transfer data between different pages. For this purpose, we generally use a global array to achieve this purpose. A global array is an array defined in one page and used throughout the application to hold the state of data so that it can be shared between different pages. The following is a detailed introduction to global arrays in different pages of PHP.

1. What is a global array

In PHP, the global array is an array used to save global variables. Global variables are variables that can be accessed anywhere in the script, and global arrays store all global variables into an array to facilitate the transfer of data between different pages.

The role of the global array is not only to transfer data, but also to store some configuration information of the system, such as configuration file paths, database connection information, etc.

2. How to use global arrays in php

If you want to use global arrays in php, then you need to use PHP's global variable $GLOBALS to access this array. $GLOBALS is a super global variable, which is a global array containing all variables.

The key name of this array is the variable name, and the key value is the value of the variable. The following is an example of the $GLOBALS array structure:

array(

"_GET" => array(...),
"_POST" => array(...),
"_COOKIE" => array(...),
"_FILES" => array(...),
"_SERVER" => array(...),
"_ENV" => array(...),
"GLOBALS" => array(...),
...

)

3. Data transfer between different pages

The following are some uses An example of a global array implementing data transfer between different pages:

1. Using the $_SESSION array

$_SESSION is a global array that can share data between different pages. Its role is to store user information on the server to ensure that the user remains logged in when visiting different pages of the website.

When a user visits your website for the first time, you need to use the session_start() function to initialize the session and create a new session ID. You can then store the data in a global array by setting the $_SESSION variable to pass data between different pages. Here is an example:

session_start();
$_SESSION['username'] = 'John';
$_SESSION['email'] = 'john @example.com';
?>

In another page, you can use the $_SESSION array to get the data stored in the previous page:

session_start();
echo $_SESSION['username'];
echo $_SESSION['email'];
?>

2. Use $_GET and $_POST array

$_GET and $_POST are two global arrays widely used in PHP. They allow you to pass data between different pages, and they are also convenient to use in forms on different pages.

When the user submits the form, the data in the form will be sent to the server, and you can use the $_POST array to get this data. Here is an example:

<input type="text" name="username" value="">
<input type="submit" value="submit">

in process.php file, you can use the $_POST array to get the data submitted in the form:

$username = $_POST['username'];
?>

If you want to pass data between different pages, you can also use the $_GET array. The $_GET array is very similar to the $_POST array, except that it passes data through URL parameters. Here is an example:

Go to Page 2

In the page2.php file, you can use the $_GET array to get the data passed in the URL:

$username = $_GET['username'];
$email = $_GET['email'];
?>

4. Conclusion

The most common way for PHP to pass data between different pages is to use a global array. A global array is an array that can be used throughout an application to store global variables and related data. When passing data between different pages, you can use global arrays such as $_SESSION, $_POST, and $_GET to pass and get data. By using global arrays, you can easily exchange and share data between different pages, improving development efficiency and code maintainability.

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