How to intercept Chinese characters by characters without garbled characters_PHP tutorial

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//$str string to be intercepted

//$len The number of characters intercepted

//$chars The number of characters that have been intercepted

//$res saved string

//$chars saves the number of intercepted strings

//$offset intercepted offset

//$length The number of bytes in the string

//If $len>$str’s number of characters, it will cause a meaningless 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);

?>