Php img images cannot be displayed in Linux

I did not pay attention to this problem when I mounted the PHP server to Linux,

A few days ago but encountered in Linux verification code under the picture can not display the situation, found that Linux also has GD library support, so installed the php5-gd (I use PhP5)

This problem has been solved.

Today, I suddenly found that the IMG images could not be displayed. I searched the internet and obtained the following conclusions after testing:

He will search for a pc.jpg image by using the previous example. If you use an absolute path, this will go into a trap.

If the current path is/var/www/test (this path has your picture. php)

 

In picture. php, it is:

Definitely an error occurs. She will search for/home/wch in the/var/www/test path

The path for searching pc.jpg is

/Var/www/test/home/wch. This path does not exist at all.

It's a bit messy. You will understand the actual operation. As for the use of absolute paths, it is still to be studied.