PHP entry-Summary of form processing problems

PHP entry-Summary of form processing problems

I have learned this over the past few days. PHP and C/C ++ have many similarities. so it seems that there is no problem with getting started. however, because I chose a Quick Start book, it is inevitable that some knowledge points are rough. for example, the following two questions make me suffer a loss.

1. The file tag of the form cannot get the file name.

I learned from books that forms

Enter your personal information Name:
Student ID:
Email:
Password:
Confirm Password:
Avatar:

By collecting information, we found that many of you encountered the same problem. it may be the same as what I read. however, after some efforts, I found the cause. It turns out that html only supports text/html file transmission by default. the form must be supported in multiple formats. so the solution is. add the attribute enctype = multipart/form-data in form. OK to solve the problem.

 

The contents of my regist. php are as follows:

 

 ;echo name is .$_POST[username].;echo number is .$_POST[id].;echo mail is .$_POST[mail].;echo password is .$_POST[password].;print_r($_FILES);?>

Upload a file and test it:

 

The input interface is as follows. I write some information. Because it is a character interface, I wrote the Avatar part.

The output interface is as follows. The file is informative. name indicates the file name on the client, and type indicates the file type. tmp_name indicates the temporary file name on the server.

2. The image tag of the form does not display the image.

This problem was also encountered during college and was resolved at that time. but after so many years. where can I remember. however, after trying a few times, I think of a solution.

At first, the path I specified was my other directory. therefore, the image cannot be displayed. I put the image in the root directory of apache, that is, under the/var/www/html directory. think too. If any file can be displayed, why does apache need to configure ROOT_DIRECTORY.

3. php garbled

We know that on the html page, encoding is specified by specifying http-equiv through meta tags. however, after the php page is redirected, the tag becomes invalid. php becomes garbled again. what should I do? There must be ready-made functions available for use. so I checked it online.

Add the header (Content-Type = text/html; charset = UTF-8) at the beginning of the PHP file. Solve the problem.

 

OK. this is some of the problems encountered in learning PHP over the past few days. to sum up, especially the first question, I found a reasonable explanation after a long time. in the next few days, I will continue to deepen my understanding and strive to write a small thing this week.