/**
* 支持中文
字符串截取
*/
function msubstr($str, $start=0, $length, $charset="utf-8", $suffix=true){
switch($charset){
case 'utf-8':$char_len=3;
break;
case 'UTF8':$char_len=3;break;
default:$char_len=2;
}
//小于指定长度，直接返回
if(strlen($str)<=($length*$char_len)){
return $str;
}
if(function_exists("mb_substr")){
$slice= mb_substr($str, $start, $length, $charset);
}else if(function_exists('
iconv_substr')){
$slice=iconv_substr($str,$start,$length,$charset);
}else{
$re['utf-8'] = "/[x01-x7f]|[xc2-xdf][x80-xbf]|[xe0-xef][x80-xbf]{2}|[xf0-xff][x80-xbf]{3}/";
$re['gb2312'] = "/[x01-x7f]|[xb0-xf7][xa0-xfe]/";
$re['gbk'] = "/[x01-x7f]|[x81-xfe][x40-xfe]/";
$re['big5'] = "/[x01-x7f]|[x81-xfe]([x40-x7e]|xa1-xfe])/";
preg_match_all($re[$charset], $str, $match);
$slice = join("",array_slice($match[0], $start, $length));
}
if($suffix)
return $slice;
return $slice;
}
string mb_substr ( string $str , int $start [, int $length [, string $encoding ]] )
<?php
function substr_unicode($str, $s, $l = null) {
return join("", array_slice(
preg_split("//u", $str, -1, PREG_SPLIT_NO_EMPTY), $s, $l));
}
$str = "Büyük";
$s = 0; // start from "0" (nth) char
$l = 3; // get "3" chars
echo substr($str, $s, $l) ."n";
echo mb_substr($str, $s, $l) ."n";
echo substr_unicode($str, $s, $l);
?>
