中国語の文字列 PHP コードをインターセプトする

/**
*
* 中国語文字列インターセプト
* @param string $string
* @param int $sublen
* @param int $start
* @param string $code
*/
function substr_zh ( $string, $sublen, $start = 0, $code = 'UTF-8' )
{
 if ( $code == 'UTF-8' )
 {
 $pa = "/[x01-x7f]|[xc2-xdf][x80-xbf]|xe0[xa0-xbf][x80-xbf]|[xe1-xef][x80-xbf][x80 -xbf]|xf0[x90-xbf][x80-xbf][x80-xbf]|[xf1-xf7][x80-xbf][x80-xbf][x80-xbf]/";
 preg_match_all ( $pa, $string, $t_string );

 if ( count ( $t_string[0] ) - $start > $sublen ) return join ( '', array_slice ( $t_string[0], $start, $sublen ) ) 。 "...";
 return join ( '', array_slice ( $t_string[0], $start, $sublen ) );
 }
 else
 {
 $start = $start * 2;
 $sublen = $sublen * 2;
 $strlen = strlen ( $string );
 $tmpstr = '';

 for ( $i = 0; $i  {
 if ( $i > = $start && $i  {
 if ( ord ( substr ( $string, $i, 1 ) ) > 129 )
 {
 $tmpstr .= substr ( $string, $i, 2 );
 }
 else
 {
 $tmpstr .= substr ( $string, $i, 1 );
 }
 }
 if ( ord ( substr ( $string, $i, 1 ) ) > 129 ) $i ++;
 }
 if ( strlen ( $tmpstr ) < $strlen ) $tmpstr .= "...";
 return $tmpstr;
 }
}

PHP