PHP UTF8 Chinese Character truncation program code-PHP source code

This article summarizes an example of a better UTF8 Chinese Character truncation program for your reference. This article summarizes an example of a better UTF8 Chinese Character truncation program for your reference.

Script ec (2); script

The simplest character truncation function is to use the substr () provided by php ()

In fact, PHP native has a multi-charset character truncation scheme, the amount, so it looks like this ...??.

In The Multibyte String Functions function family,

String mb_substr (string $ str, int $ start [, int $ length [, string $ encoding]) is used to intercept strings.

Int mb_strlen (string $ str [, string $ encoding]) returns the string length.

However, it only supports numbers and letters and does not support Chinese characters.

Instance

UTF8 Chinese Character Truncation

The Code is as follows:

/* UTF-8 Chinese Character truncation Program */ $ Str = "123 this is a test string "; $ Str1 = "()()"; Echo subUTF8str ($ str, 0, 3 )." "; Echo subUTF8str ($ str, 0, 4 )." "; Echo subUTF8str ($ str1, 0, 4 )." "; Echo subUTF8str ($ str1, 0, 10 )." "; Function subUTF8str ($ str, $ start = 0, $ length = 80 ){ $ Cur_len = 0; // String Length understood by a person $ All_len = strlen ($ str); // machine understanding String Length If ($ length> $ all_len) { Return $ str; } For ($ I = 0; $ I <$ all_len ;) { If ($ cur_len = $ start) { Break; } If (ord ($ str [$ I])> 127) { $ I + = 3; } Else { $ I + = 1; } $ Cur_len ++; } $ Start_pos = $ I; $ Temp_pos = $ cur_len; For (; $ cur_len-$ temp_pos <$ length ;) { If ($ I >=$ all_len) Break; If (ord ($ str [$ I])> 127) { $ I + = 3; } Else { $ I + = 1; } $ Cur_len ++; } $ End_pos = $ I; Return substr ($ str, $ start_pos, $ end_pos ); } ?>

After improvement, we will paging it to support Chinese characters such as ut8 and gbk.

The Code is as follows:

Function substrs ($ content, $ length ){ If ($ length & strlen ($ content)> $ length ){ If ($ db_charset! = 'Utf-8 '){ $ Retstr = ''; For ($ I = 0; $ I <$ length-2; $ I ++ ){ $ Retstr. = ord ($ content [$ I]) & gt; 127? $ Content [$ I]. $ content [++ $ I]: $ content [$ I]; } Return $ retstr; } Else { Return utf8_trim (substr ($ content, 0, $ length * 3 )); } } Return $ content; } Function utf8_trim ($ str ){ $ Len = strlen ($ str ); For ($ I = strlen ($ str)-1; $ I >=0; $ I-= 1 ){ $ Hex. = ''. ord ($ str [$ I]); $ Ch = ord ($ str [$ I]); If ($ ch & 128) = 0) return substr ($ str, 0, $ I ); If ($ ch & 192) = 192) return substr ($ str, 0, $ I ); } Return ($ str. $ hex ); }