php 截取中文

< ?php
//截取中文字符串
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编码的多字节字符串

< ?php
//截取utf8字符串
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都支持的汉字截取函数

< ?php
/*
Utf-8、gb2312都支持的汉字截取函数
cut_str(字符串, 截取长度, 开始长度, 编码);
编码默认为 utf-8
开始长度默认为 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;
}
}

$str = abcd需要截取的字符串;
echo cut_str($str, 8, 0, gb2312);
?>

4. BugFree 的字符截取函数

< ?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 = CodeBit.cn — 简单、精彩、通用;
$Length = 18;
$Append = false;
echo sysSubStr($String,$Length,$Append);
?>

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