Chinese interception without garbled characters (2 methods)
- //$str The string to be intercepted
- //$len The number of characters to be intercepted
- //$chars The number of characters that have been intercepted
- //$res The saved string
- // $chars stores the number of intercepted strings
- //$offset is the intercepted offset
- //$length is the number of bytes of the string
- //If $len>the number of characters in $str, it will cause a unnecessary while loop , ($offset<$length limit)
- function utf8sub($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;
- }
- $a="中华ah人hdj";
- echo utf8sub($a,5);
- ?>
|
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
