How to customize and intercept Chinese strings in php

This topic describes in detail how to customize and intercept Chinese strings in php. The implementation method of the code is displayed to help beginners learn. Php custom truncation of Chinese Strings-utf8

The encoding range of the UTF-8 (UTF-8 uses 1-6 bytes to encode characters, actually only uses 1-4 bytes ):

1 byte: 00--7F2 byte: C080--DFBF3 characters: E08080--EFBFBF4 characters: F0808080--F7BFBFBF

$ Str = 'abcd I am China'; echo strlen ($ str ),'
'; Echo mstrlen ($ str ),'
'; Echo msubstr ($ str, 3, 9);/*** count the string length in utf8 */function mstrlen ($ str) {$ len = 0; $ I = 0; $ slen = strlen ($ str); while ($ I <$ slen) {$ o = ord ($ str [$ I]); if ($ o <127) {$ I ++;} elseif ($ o <224) {$ I + = 2;} else {$ I + = 3 ;} $ len ++;} return $ len;}/*** truncate the UTF-8 encoded string */function msubstr ($ str, $ start, $ length) {$ len = mstrlen ($ str); if ($ start <0) {$ start + = $ len; if ($ start <0) {$ start = 0 ;}} $ slen = strlen ($ str); $ index = 0; for ($ I = 0; $ I <$ start & $ I <$ slen; $ I ++) {$ o = ord ($ str [$ index]); if ($ o <127) {$ index ++;} elseif ($ o <224) {$ index + = 2;} else {$ index + = 3; }}$ length + = $ index; $ newStr = ''; for ($ I = $ index; $ I <$ length & $ I <$ slen; $ I ++) {$ o = ord ($ str [$ I]); if ($ o <127) {$ newStr. = $ str [$ I];} elseif ($ o <224) {$ newStr. = substr ($ str, $ I, 2); $ I + = 1; $ length ++;} else {$ newStr. = substr ($ str, $ I, 3); $ I + = 2; $ length + = 2;} return $ newStr ;}

The preceding figure shows how to customize and intercept Chinese strings in php. For more information, see other related articles in the first PHP community!