How to custom intercept Chinese strings in php

php custom interception of Chinese strings-utf8 version

UTF-8 encoding range (utf-8 uses 1-6 bytes to encode characters, but actually only uses 1-4 bytes) :

1个字节：00——7F
2个字节：C080——DFBF
3个字符：E08080——EFBFBF
4个字符：F0808080——F7BFBFBF

rrree

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