//$str 待截取的字符串
//$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<$length限定)
function pub_rep($str,$len){
$res=
"";
$info=
"";
$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;
}
$rep=
"...";
$res.=
$rep;
return $res;
}
转载于:https://www.cnblogs.com/hgj123/p/3859452.html
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