A brief analysis of the POST method in PHP with parameters to jump to the page

For PHP developers, using POST to jump to a page with parameters is a basic skill. POST is a method of sending data in HTTP. It can submit data to the server through HTTP requests. The jump page processes and jumps the page on the server side. In actual development, we often need to use POST with parameters to jump to pages to achieve certain functional purposes.

1. The basis of POST jump page with parameters

1.1 POST method

The POST method is one of the HTTP requests. It can The server submits the data. Compared with the GET method, the POST method can submit a larger amount of data without exposing the data in the URL, making it safer and more reliable. The following is the request header of the POST method:

POST /path HTTP/1.1
Host: example.com
Content-Type: application/x-www-form-urlencoded
Content-Length: 32

data=value&data2=value2

1.2 $_POST array

After submitting data using the POST method, we can obtain the submitted data through the $_POST array, where $_POST[' key'] represents the data named key submitted in the POST method. It should be noted that the $_POST array can only be obtained in the processing code of the page, because the data has been sent to the server and can only be obtained through the server side.

1.3 header function

The header function can be used to jump to pages or set HTTP response header information. Among them, when setting the jump page, you need to set the value of the Location field, as follows:

header("Location: http://www.example.com/path");

2. Implementation of using POST to jump to the page with parameters

2.1 Build the form

First, you need to build a form in HTML for submitting POST parameters. The action attribute needs to be set in the form to indicate the processing page after the form is submitted. At the same time, the method attribute needs to be set to POST to submit data using the POST method. The following is a simple form code example:

<form action="process.php" method="POST">
 <input type="text" name="username">
 <input type="password" name="password">
 <input type="submit" value="登录">
</form>

2.2 Processing POST parameters

After the form is submitted, the POST parameters need to be processed on the server side. Normally, we will process it in a separate PHP page, such as process.php. In process.php, we can use the $_POST array to obtain the submitted POST parameter value, such as:

$username = $_POST['username'];
$password = $_POST['password'];

Then, we can perform related processing, such as verifying whether the username and password are correct, etc. If the verification is passed, you can jump to other pages.

2.3 Jump page

Jumping page needs to be implemented using the header function. After successfully verifying the username and password, you can set the value of the Location field as follows:

header("Location: http://www.example.com/welcome.php");

This code will cause the browser to request http://www.example.com/welcome.php , and display the page.

3. Usage scenarios of POST jump pages with parameters

3.1 User login

User login is the most common POST jump page with parameters One of the usage scenarios. The user enters the username and password in the login box and clicks submit, which is submitted to the server through POST. After processing on the server, if the verification is passed, it will jump to the user's homepage. If the verification fails, return to the login page.

3.2 Data Query

In web applications, it is often necessary for users to enter some parameters and then submit them to the server through POST for related data queries. The query results will be returned to different pages according to different situations, and users can obtain the data they need based on the display of the page.

3.3 Data submission

Data submission is also one of the common usage scenarios of POST jump pages with parameters. For example, when a user fills out an online questionnaire and clicks submit, the page will submit the questionnaire data to the server through POST. After the server verifies the data, it saves it to the database and displays a thank you page or other related pages on the page.

4. Summary

POST jump page with parameters is a relatively basic skill point in Web application development. Mastering this technology can help us better Fulfill some business requirements. It should be noted that sensitive data in POST parameters needs to be encrypted for transmission, otherwise it may lead to the risk of data leakage. At the same time, when using the header function to jump to a page, you need to ensure that no HTML code is output to the browser, otherwise the header function will not take effect.

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