Php string truncation method Daquan php string truncation four examples

Php string truncation method Daquan php string truncation four examples

// 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 // 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 /* Utf-8, gb2312 are supported by the Chinese character truncation function cut_str (string, truncation length, start length, encoding); default encoding for UTF-8 start length is 0 */ 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 =" string to be intercepted by abcd "; echo cut_str ($ str, 8, 0, 'gb2312');?> 4. BugFree character truncation function /** * @ 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 * @ 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 = "CodeBit.cn -- simple, brilliant, and general "; $ Length = "18 "; $ Append = false; Echo sysSubStr ($ String, $ Length, $ Append ); ?>