php中對中文字串截取的方法總結

這篇文章主要為大家詳細介紹了php中文字串截取多種方法，具有一定的參考價值，感興趣的朋友可以參考一下

1. 截取GB2312中文字串

<?php < ?php//截取中文字串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. 截取utf8編碼的多位元組字串

<?php< ?php//截取utf8字串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. UTF-8、GB2312都支援的漢字截取函數

<?php< ?php/*Utf-8、gb2312都支援的漢字截取函數cut_str(字串, 截取長度, 開始長度, 編碼);編碼預設為 utf-8開始長度預設為 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;  }} $str = "abcd需要截取的字串";echo cut_str($str, 8, 0, 'gb2312');?>

4. BugFree 的字元截取函數

< ?php/** * @package   BugFree * @version   $Id: FunctionsMain.inc.php,v 1.32 2005/09/24 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;  }} $String = "17test.info 走在中國自動化測試的前沿";$Length = "18";$Append = false;echo sysSubStr($String,$Length,$Append);?>