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This article mainly introduces "what is the method of PHP form input and verification". In daily operation, I believe that many people have doubts about the method of PHP form input and verification. Xiaobian consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful to answer the doubts of "what is the method of PHP form input and verification?" Next, please follow the editor to study!

In the previous article, we learned the basics of PHP, including the $_ GET and $_ POST variables, which are used to retrieve information in the form, and the knowledge points we need to pay attention to are PHP form user input and form validation. Then let's take a look at the knowledge of form input and form validation in PHP.

PHP forms and user input

To understand PHP forms and user input, we first need to understand what a form is. Web form is exactly an interactive platform, the main function is to allow visitors and the site to have an interactive platform. Forms are mainly used in web pages to send data to the server.

For example, the form used when registering information needs to be submitted when you finish filling out the information, which means that the content of the form when you register is transmitted from the client browser to the server, and then processed by the PHP program, and then the information needed by the user is transmitted back to the client browser to enable PHP to interact with the Web form by obtaining the user's information. Is to provide such an interactive platform.

Next, let's take a look at the form with an example, as follows:

Name:

Age:

What we need to pay attention to is the knowledge that the form belongs to HTML. For more related knowledge, you can click "HTML tutorial" to learn. The running result of the above example:

This is what we call a form, so where will the information we fill in, that is, the form information, be sent? When we click submit, the data in the form will be sent to the form.php page as POST.

The running result we sent to from.php is as follows:

When the user input is complete, the form needs to be validated, and the user input should be validated through client script whenever possible. Browser verification is faster and can lighten the load on the server.

If user input needs to be inserted into the database, you should consider using server authentication. A good way to validate a form on the server is to pass the form to itself instead of jumping to a different page. In this way, users can get error messages on the same form page. It is also easier for users to find errors. So let's take a look at the knowledge of form validation.

PHP form validation

We need to consider security when dealing with PHP forms. We will show the safe handling of PHP form data. In order to prevent hackers and spam, we need to perform data security validation on the form. Let's take a look at the must and optional text fields, radio buttons, and submit buttons in the form through an example.

Examples are as follows:

PHP.cn PHP form validation instance "> name:

E-mail:

Web site:

Remarks:

Gender: male and female

Output result:

One of the things we need to pay attention to is:

When we execute the above script, we use $_ SERVER ["REQUEST_METHOD"] to detect whether the form has been submitted. If REQUEST_METHOD is POST, the form will be submitted-the data will be validated. If the form is not submitted, validation is skipped and blank is displayed. The use of input items in the above examples is optional and can be displayed normally even if the user does not enter any data.

At this point, the study on "what is the method of input and validation of PHP forms" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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