How to correctly count Chinese characters? _PHP Tutorial

PHP code:------------------------------------------------ ----------------------------------
function ccStrLen($str) #Calculate mixed Chinese and English strings Length
{
$ccLen=0;
$ascLen=strlen($str);
$ind=0;
$hasCC=ereg("[xA1-xFE]",$ str); #Determine whether there are Chinese characters
$hasAsc=ereg("[x01-xA0]",$str); #Determine whether there are ASCII characters
if($hasCC && !$hasAsc) #Only Chinese characters Case
return strlen($str)/2;
if(!$hasCC && $hasAsc) #Only Ascii characters case
return strlen($str);
for($ind=0 ;$ind<$ascLen;$ind++)
{
if(ord(substr($str,$ind,1))>0xa0)
{
$ccLen++;
$ ind++;
}
else
{
$ccLen++;
}
}
return $ccLen;
}
function ccStrLeft($str,$len ) #Intercept the Chinese and English mixed string from the left
{
$ascLen=strlen($str); if($ascLen<=$len) return $str;
$hasCC=ereg("[xA1 -xFE]",$str); #Same as above
$hasAsc=ereg("[x01-xA0]",$str);
if(!$hasCC) return substr($str,0,$len );
if(!$hasAsc)
if($len & 0x01) #If the length is an odd number
return substr($str,0,$len+$len-2);
else
return substr($str,0,$len+$len);
$cind=0;$flag=0;
while($cind<$ascLen)
{
if(ord (substr($str,$cind,1))<0xA1) $flag++;
$cind++;
}
if($flag & 0x01)
return substr($str,0, $len);
else
return substr($str,0,$len-1);
}
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