中文截取无乱码（2种方法）
- //$str 待截取的字符串
- //$len 截取的字符个数
- //$chars 已经截取的字符数
- //$res 保存的字符串
- //$chars 保存已经截取的字符串个数
- //$offset 截取的偏移量
- //$length 字符串的字节数
- //若$len>$str的字符个数，造成无谓的while循环，($offset<$length限定)
- function utf8sub($str,$len){
- if($len<=0){
- return ;
- }
- $res="";
- $offset=0;
- $chars=0;
- $length=strlen($str);
- while($chars<$len && $offset<$length){
-
- $hign=decbin(ord(substr($str,$offset,1)));
- if(strlen($hign)<8){
- $count=1;
- }elseif(substr($hign,0,3)=="110"){
- $count=2;
- }elseif(substr($hign,0,4)=="1110"){
- $count=3;
- }elseif(substr($hign,0,5)=="11110"){
- $count=4;
- }elseif(substr($hign,0,6)=="111110"){
- $count=5;
- }elseif(substr($hign,0,7)=="1111110"){
- $count=6;
- }
-
- $res.=substr($str,$offset,$count);
- $offset+=$count;
- $chars+=1;
-
-
- }
- return $res;
- }
- function utf8sub1($str,$len){
- $chars=0;
- $res="";
- $offset=0;
- $length=strlen($str);
- while($chars<$len && $offset<$length){
- $hign=decbin(ord(substr($str,$offset,1)));
- if(strlen($hign)<8){
- $count=1;
- }elseif($hign & "11100000"=="11000000"){
- $count=2;
- }elseif($hign & "11110000"=="11100000"){
- $count=3;
- }elseif($hign & "11111000"=="11110000"){
- $count=4;
- }elseif($hign & "11111100"=="11111000"){
- $count=5;
- }elseif($hign & "11111110"=="11111100"){
- $count=6;
- }
- $res.=substr($str,$offset,$count);
- $chars++;
- $offset+=$count;
- }
- return $res;
- }
- $a="中华ah人民hdj";
- echo utf8sub($a,5);
- ?>
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