Php user-defined Chinese string interception function substr_for_gb2312 and how to use substr_for_utf8

This article mainly introduces the php custom Chinese string interception function substr_for_gb2312 and substr_for_utf8 how to use, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let Xiaobian take you to understand.

The details are as follows:

/ * * gb2312 Chinese string interception * / function substr_for_gb2312 ($str,$start,$len=null) {$totlelength = strlen ($str); / / Special case if ($len= = null) $len= $totlelength; if ($len= = 0) return ""; if ($len > = $totlelength & & $start = 0) return $str; if ($start > $totlelength) return "; / / analyze $start if ($start)

= $totlelength) $start = 0; else $start = $totlelength-abs ($start);} / / determine the starting position. When the starting bit splits a Chinese character, the return value contains the Chinese character. If ($start > 0) {$I = $start-1; $flag=-1; while ($I > = 0) {if (ord (substr ($str,$i,1)) > 160) {$flag=-1 housekeeping;} else break; $iLue;} if ($flag==1) {$start = $start-1; $len++; / / guarantee no displacement. } $str = substr ($str,$start); / / truncate the character before the $start bit of the string $totlelength = strlen ($str); / / determine the end position, when the end bit splits a Chinese character, the return value does not contain the Chinese character. If ($len160) {$flag=-1*$flag;} else break; $iMurray;} if ($flag= = 1) $len=$len-1; $subit=substr ($str,0,$len); return $subit } / * PHP intercepts the UTF-8 string to solve the half-character problem. * English, numeric (half-width) is 1 byte (8 bits) Chinese (full width) is a 3-byte string taken out by * @ return, when $len is less than or equal to 0 The length of the entire string * @ param $str source string * $len left substring * / function substr_for_utf ($str,$len) {for ($iTun0) is returned * * utf8 interception function with start location * / function utf8_substr ($string, $start, $length) {preg_match_all ('/ [/ x00-/x7F] | [/ xC2-/xDF] [/ x80-/xBF] | [/ xE0-/xEF] [/ x80-/xBF] [/ x80-/xBF] | [/ xF0-/xF4] [/ x80-/xBF] [/ x80-/xBF] [/ x80-/xBF] /, $string, $rs); $out ='' $size = count ($rs [0]); $end = $start + $length; if ($end > $size) {$end = $size;} for ($I = $start; $I < $end; $iTunes +) {$out. = $rs [0] [$I];} return $out } Thank you for reading this article carefully. I hope the article "php Custom Chinese string interception function substr_for_gb2312 and how to use substr_for_utf8" shared by the editor will be helpful to you. At the same time, I hope you will support us and follow the industry information channel. More related knowledge is waiting for you to learn!