How to jump and pass parameters in PHP

In PHP, jumping to a page is a very common operation. Sometimes we need to bring some parameters while jumping, so that the parameters can be obtained on the target page and the corresponding operations can be performed. This article will introduce how to jump and pass parameters in PHP.

1. Use the GET method to pass parameters

In the HTTP protocol, the GET request can append parameters to the URL address. In PHP, we can use the $_GET array to get the parameters in the URL address.

The following is a sample code:

// 获取参数
$param1 = $_GET['param1'];
$param2 = $_GET['param2'];

// 输出参数
echo 'param1: '.$param1.'<br>';
echo 'param2: '.$param2.'<br>';

When we append parameters to the URL address, for example:

http://example.com/index.php?param1=value1&param2=value2

The above sample code will get the value of param1 as value1, param2 The value is value2 and is output to the page.

In actual applications, we can use the header function to jump to the page and append parameters to the URL address.

The sample code is as follows:

// 跳转并传递参数
header('Location: http://example.com/index.php?param1=value1&param2=value2');

The above code will pass the two parameters param1 and param2 when jumping to the http://example.com/index.php page.

2. Use the POST method to pass parameters

Although the GET method can append parameters to the URL address, there are security risks. Because the parameters in the URL address can be easily intercepted and viewed by others. To solve this problem, we can use POST method to pass parameters to the server.

In PHP, we can also use the $_POST array to obtain the parameters in the POST request. The following is a sample code:

// 获取参数
$param1 = $_POST['param1'];
$param2 = $_POST['param2'];

// 输出参数
echo 'param1: '.$param1.'<br>';
echo 'param2: '.$param2.'<br>';

In actual applications, we can use the form form to submit a POST request and pass the parameters to the server. The following is a sample code:

              

The above code will send a POST request to the http://example.com/index.php page, with param1 and param2 attached to the request.

3. Use SESSION to pass parameters

In some cases, we need to pass some parameters between different pages, but we do not want these parameters to be exposed in the URL address, nor do we want to Use the POST method to resubmit the parameters each time. At this time, we can use SESSION to pass between pages.

SESSION is a very important session management mechanism in PHP. It stores some data on the server side and associates this data with the user's session ID. Because the session ID is passed between client and server, we can share this data between different pages.

The following is a simple example:

// 在页面1中设置SESSION
session_start();
$_SESSION['param1'] = 'value1';
$_SESSION['param2'] = 'value2';

// 在页面2中获取SESSION
session_start();
$param1 = $_SESSION['param1'];
$param2 = $_SESSION['param2'];

// 输出参数
echo 'param1: '.$param1.'<br>';
echo 'param2: '.$param2.'<br>';

The above example code will set a SESSION variable named param1 and param2 in page 1, and set their values ​​to value1 and param2 respectively. value2. In page 2, we obtained the values ​​of these two SESSION variables through the $_SESSION array and successfully output them to the page.

Summary

Whether you use the GET method, POST method, SESSION, or other parameter transfer methods, they all have their own advantages and disadvantages. In actual development, we need to choose the appropriate method according to the specific situation. At the same time, security must be kept in mind at all times to avoid security problems when passing parameters.

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