问一个老问题，如何避免切割字符串的时候切出半个中文字符？

Question

function  csubstr($string,$start,$length)        
       {  
               $str="";  
               $len=$start+$length;  
               for($i=$start;$i<$len;$i++){  
                       if(ord(substr($string,$i,1))>0xa0){        
                               $str.=substr($string,$i,2);        
                               $i++;        
                       }        
                       else          
                               $str.=substr($string,$i,1);  
               }                    
                         
               return  $str;                
       }  看看这个好不好用，别人写的

Answer 1

function substrGB($string,$start,$len)
{
for($i=0;$i<$start+$len;$i++)
{
$tmpstr=(ord($string[$i])>=161 && ord($string[$i])<=247 && ord($string[$i+1])>=161 && ord($string[$i+1])<=254)?$string[$i].$string[++$i]:$tmpstr=$string[$i];
if ($i>=$start&&$i<($start+$len))$tmp .=$tmpstr;
}
return $tmp;
}

Answer 2

//$str 要截取的字符串
  //$start 从第$start个字符开始截取，一般取 0
  //$len 截取长度
  function CsubStr($str,$start,$len)
  {
           $strlen=strlen($str);
           $clen=0;
           for($i=0;$i<$strlen;$i++,$clen++)
           {
               if ($clen>=$start+$len)
               {
                   $tmpstr.="..";
                   break;
               }
               if(ord(substr($str,$i,1))>0xa0)
               {
                  if ($clen>=$start)
                  $tmpstr.=substr($str,$i,2);
                  $i++;
               }
               else
               {
                   if ($clen>=$start)
                   $tmpstr.=substr($str,$i,1);
               }
           }
           return $tmpstr;
  }
不好意思，我也是找过来用的。

Answer 3

http://www.dev-club.com/club/bbs/showEssence.asp?id=15340

Answer 4

$vsmystr=ABabySubstr('我是ABabyStudio，请多多指教！',4);
echo($vsmystr.'<br/>');function ABabySubstr($vsstr_,$vilen_){
$vsreturn='';
$viindex=0;
$vitmp=0;
$vstmp='';
$vicncharaterend=0;
$vscharacter=substr($vsstr_,$viindex,1);
$vsrealcharacter=substr($vsstr_,$viindex,1);
while(strlen($vsrealcharacter)){
$viindex++;
if(ord($vscharacter)<0 || ord($vscharacter)>127){
if($vicncharaterend==0){
$vicncharaterend=1;
}
else{
$vitmp++;
$vicncharaterend=0;
}
}
else{
$vitmp++;
}
$vstmp=$vstmp.$vscharacter;
if($vitmp==$vilen_){
$vsreturn=$vstmp;
            break;
}
if(!strlen(substr($vsstr_,$viindex,1))){
$vsreturn=$vstmp;
break;
}
$vscharacter=substr($vsstr_,$viindex,1);
$vsrealcharacter=substr($vsstr_,$viindex,1);
}
return($vsreturn);
}

Answer 5

改进了一点
---------------
$vsmystr=ABabySubstr('我是ABabyStudio，请多多指教！',1,14);
echo($vsmystr.'<br/>');function ABabySubstr($vsstr_,$vistart_,$vilen_){
$vsreturn='';
$viindex=0;
$vitmp=0;
$vstmp='';
$vicncharaterend=0;
$vscharacter=substr($vsstr_,$viindex,1);
$vsrealcharacter=substr($vsstr_,$viindex,1);
while(strlen($vsrealcharacter)){
$viindex++;
if(ord($vscharacter)<0 || ord($vscharacter)>127){
if($vicncharaterend==0){
$vicncharaterend=1;
}
else{
$vitmp++;
$vicncharaterend=0;
}
}
else{
$vitmp++;
}
if($vitmp>$vistart_ || ($vitmp==$vistart_ && $vicncharaterend==1)){
$vstmp=$vstmp.$vscharacter;
if($vitmp-$vistart_==$vilen_){
$vsreturn=$vstmp;
break;
}
if(!strlen(substr($vsstr_,$viindex,1))){
$vsreturn=$vstmp;
break;
}
}
$vscharacter=substr($vsstr_,$viindex,1);
$vsrealcharacter=substr($vsstr_,$viindex,1);
}
return($vsreturn);
}