2 classes in PHP dealing with intercepting Chinese characters and having garbled problems

Chinese Characters | problem function Msubstr ($str, $start, $len) {
$strlen = $start + $len;
for ($i =0; $i < $strlen; $i + +) {
if (Ord (substr ($str, $i, 1)) >0xa0) {
$tmpstr. =substr ($str, $i, 2);
$i + +;
} else
$tmpstr. =substr ($str, $i, 1);
}
return $tmpstr;
}

－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－
? Php
$str = "This character is very long ah, '";
$Short _str=showshort ($STR, 4);//intercept the front 4 characters, the result is: this character ...
Echo "$Short _str";
Function csubstr ($str, $start, $len)
{
$strlen =strlen ($STR);
$clen = 0;
for ($i =0; $i < $strlen; $i + +, $clen + +)
{
if ($clen >= $start + $len)
Break
if (Ord (substr ($str, $i, 1)) >0xa0)
{
if ($clen >= $start)
$tmpstr. =substr ($str, $i, 2);
$i + +;
}
Else
{
if ($clen >= $start)
$tmpstr. =substr ($str, $i, 1);
}
}

return $tmpstr;
}
Function Showshort ($STR, $len)
{
$tempstr = csubstr ($str, 0, $len);
if ($str <> $tempstr)
$tempstr. = "..."; What you want to end with, modify it here.

return $tempstr;
}