How does the phpcodeigniter framework change the view page encoding language?

Add the following sentence to the head tag of the hosts file & lt; head & gt; php codeigniter framework: how can I change the view page encoding language to Chinese in English?
I am a newbie. I just learned php and used codeigniter framework to practice. After I changed the content on the page to Chinese, I debugged the website and found that the output was garbled. Which of the following Experts knows how to solve this problem?
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This should be a question for the browser. if you open the. html file and add the following sentence to the head tag



如果打开的是php页面
在文件开头加
header("Content-type: text/html; charset=utf-8");