Collection of string functions in php

Truncates GB2312 Chinese strings.

The code is as follows:	Copy code
<? Php // Truncate a Chinese string Function mysubstr ($ str, $ start, $ len ){ $ Tmpstr = ""; $ Strlen = $ start + $ len; For ($ I = 0; $ I <$ strlen; $ I ++ ){ If (ord (substr ($ str, $ I, 1)> 0xa0 ){ $ Tmpstr. = substr ($ str, $ I, 2 ); $ I ++; } Else $ Tmpstr. = substr ($ str, $ I, 1 ); } Return $ tmpstr; } ?>

2. Truncate UTF-8 encoded multi-byte strings

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<? Php // Truncate the utf8 string Function utf8Substr ($ str, $ from, $ len) { Return preg_replace ('# ^ (? : [X00-x7F] | [xC0-xFF] [x80-xBF] +) {0, '. $ from .'}'. '((? : [X00-x7F] | [xC0-xFF] [x80-xBF] +) {0, '. $ len.'}). * # s ', '$ 1', $ str ); } ?>

3. Chinese character truncation functions supported by UTF-8 and GB2312 <? Php

/*

Chinese character truncation functions supported by Utf-8 and gb2312

Cut_str (string, truncation length, start length, encoding );

The default encoding format is UTF-8.

The default start length is 0.

*/

The code is as follows:

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Function cut_str ($ string, $ sublen, $ start = 0, $ code = 'utf-8 ') { If ($ code = 'utf-8 ') { $ Pa = "/[x01-x7f] | [xc2-xdf] [x80-xbf] | xe0 [xa0-xbf] [x80-xbf] | [xe1-xef] [x80-xbf] [x80-xbf] | xf0 [x90-xbf] [x80-xbf]] [x80-xbf] | [xf1-xf7] [x80-xbf] [x80-xbf] [x80-xbf]/"; Preg_match_all ($ pa, $ string, $ t_string );   If (count ($ t_string [0])-$ start> $ sublen) return join ('', array_slice ($ t_string [0], $ start, $ sublen )). "... "; Return join ('', array_slice ($ t_string [0], $ start, $ sublen )); } Else { $ Start = $ start * 2; $ Sublen = $ sublen * 2; $ Strlen = strlen ($ string ); $ Tmpstr = '';   For ($ I = 0; $ I <$ strlen; $ I ++) { If ($ I >=$ start & $ I <($ start + $ sublen )) { If (ord (substr ($ string, $ I, 1)> 129) { $ Tmpstr. = substr ($ string, $ I, 2 ); } Else { $ Tmpstr. = substr ($ string, $ I, 1 ); } } If (ord (substr ($ string, $ I, 1)> 129) $ I ++; } If (strlen ($ tmpstr) <$ strlen) $ tmpstr. = "..."; Return $ tmpstr; } }   $ Str = "the string to be intercepted by abcd "; Echo cut_str ($ str, 8, 0, 'gb2312 '); ?>

4. BugFree character truncation function <? Php

The code is as follows:

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/** * @ Package BugFree * @ Version $ Id: FunctionsMain. inc. php, v 1.32 11:38:37 wwccss Exp $ * * * Return part of a string (Enhance the function substr ()) * * @ Author Chunsheng Wang <wwccss@263.net> * @ Param string $ String the string to cut. * @ Param int $ Length the length of returned string. * @ Param booble $ Append whether append "...": false | true * @ Return string the cutted string. */ Function sysSubStr ($ String, $ Length, $ Append = false) { If (strlen ($ String) <= $ Length) { Return $ String; } Else { $ I = 0; While ($ I <$ Length) { $ StringTMP = substr ($ String, $ I, 1 ); If (ord ($ StringTMP) >=224) { $ StringTMP = substr ($ String, $ I, 3 ); $ I = $ I + 3; } Elseif (ord ($ StringTMP) >=192) { $ StringTMP = substr ($ String, $ I, 2 ); $ I = $ I + 2; } Else { $ I = $ I + 1; } $ StringLast [] = $ StringTMP; } $ StringLast = implode ("", $ StringLast ); If ($ Append) { $ StringLast. = "..."; } Return $ StringLast; } }   $ String = "111cn.net -- simple, brilliant, and general "; $ Length = "18 "; $ Append = false; Echo sysSubStr ($ String, $ Length, $ Append ); ?>