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
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