Use PHP to intercept specified length_PHP tutorial

function cutstr($string,$length, $ dot = ' ...') {
if (strlen($string) <= $length) {
return$string;
}
$pre = chr(1);
$end = chr(1);
$string = str_replace(array('&','"', '<', '>'),array($pre . '&'. $end, $pre . '"' . $end, $pre . '<' .$end, $pre . '>' . $end), $string);

$strcut = '';
if (strtolower(CHARSET) == 'utf-8'){
$n = $tn =$noc = 0;
while ($n< strlen($string)) {

                                                                                                                                               
$tn = 1;
$n++;
$noc++;
} elseif (194 <= $t&& $t <= 223) {
$tn = 2;
              $n += 2;                                                     $n + = 3;
                          $noc += 2;                                                                                                                                                           ​​​          $noc += 2;
} elseif ($t == 252 || $t ==253) {
                $tn = 6;
                                                                                                                                                                  }
}
if ($noc> $length) {
                                                                                                                                 $i =0; $i < $length; $i++) {
             $strcut .= ord($string[$i])> 127 ? $string[$i] . $string[++$i ] : $string[$i];
}
}
$strcut = str_replace(array($pre . '&' .$end, $pre . '"' . $end, $pre . '<' . $end, $pre . '>' .$end), array('&', '"','<', '>'), $strcut);

$pos = strrpos($strcut, chr(1));
if ($pos !== false) {
$strcut =substr($strcut, 0, $pos);
}
return $strcut . $dot;
}





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