Although this problem is small, it is a bit difficult to locate. After several confirmations, we have the following solution:
The first step can be set in Dreamweaver (in the Title/Encoding tag under Page Properties You can see it below);
Step 2, if php is actually edited under eclipse, you can set it in the setting encoding under the Edit tab
Step 3, browser encoding settings, depending on the browser, the corresponding Just set it up. (Can be set to automatically detect and utf-8)
The above has introduced the submission form. When jumping to the PHP page, garbled characters appear, including the submission form and PHP content. I hope it will be helpful to friends who are interested in PHP tutorials.