Self-implemented phpUTF8 Chinese string truncation header ("Content-type: text/html; charset = utf-8"); functionmy_substr ($ str, $ begin, $ length) {$ I = $ begin; $ r implements php UTF8 Chinese string truncation by itself
Header ("Content-type: text/html; charset = utf-8"); function my_substr ($ str, $ begin, $ length) {$ I = $ begin; $ result = ""; while ($ length> 0) {if ([color = red] ord ($ str [$ I])> 127 [/color]) {$ result. = substr ($ str, $ I, 3); $ I = $ I + 3;} else {$ result. = substr ($ str, $ I, 1); $ I ++;} $ length --;} return $ result;} $ chinese = "chinese people"; echo"
". My_substr ($ chinese, 0, 3 );
The output result is: China
Note:
Ord is the assic value for the character.
Chr is a character for assic.
Why is it determined that assic is greater than 127.
Here is the ASSIC code table
Http://www.asciitable.com/
In the computer, only ASSIC encoding is used to indicate characters. An ASSIC character is represented by a BYTE. Therefore, ASSIC has a maximum of 256 combinations. It is sufficient for English, but not for Chinese, Japanese, Korean, and other Asian languages.
Therefore, you can only use multiple bytes to represent a Chinese character. for example, GB2312 represents a Chinese character in two bytes. In windows, create a TXT file in the notebook and save it as ASSIC. if you are using a simplified Chinese operating system, the Chinese text in the TXT file is saved as GB2312. The program $ result. = substr ($ str, $ I, 3) in the above string is changed to 3. do not forget to modify the header. And whether GB2312 or UTF8 they said A-Z and other ASSIC 128 before is the same, is a BTYE representation, is variable length encoding. So we can use ASSIC to determine whether they are Chinese or not.
The write may be messy. Exercise caution when necessary.
