PHP character encoding problem: GB2312 VS UTF-8_PHP tutorial

I wrote a piece of code based on the book today. The purpose of the code is to use the str_split() function to split a string into an array. It is easy to speak in English, but there is a problem when splitting Chinese (two Chinese and one array unit)——

Look at the code:

>http://www.w3.org/TR/html4/loose.dtd ">

$string1 = "i am a phper";

$string2 = "This book is about blue ocean strategy";

print_r(str_split($string1));

echo "
"; 

print_r(str_split($string2,4));

?>

　

The test result came out as I expected - Chinese garbled characters

Why? Why? Why? Why? What is garbled code? What is garbled code? Explain to me, what is the garbled code of %&!

Because there are no garbled characters in English but only Chinese garbled characters, I first thought about the encoding problem, and then suddenly remembered that the encoding of UTF-8 is that UTF-8 requires 3 bytes. Let’s treat it like a dead horse!

So print_r(str_split($string2,4)); the 4 in this sentence was replaced by 6, so - look at the result

Similarly, you can also try changing the UTF-8 of the encoded charset to GB2312. Because Unicode encoding requires 2 bytes, Gb2312 encoding can save 1/3 of the space than UTF-8. But if you want to be compatible with other languages ​​such as Traditional Chinese, Korean, and Japanese, you need to use UTF-8.

By the way, I discovered the first dynamic music, and I want to share it with you:

　—Its Ok?

　—Its OK!