使用php实现截取指定长度

2024-05-04 22:24:28

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PHP语言: 根据中文裁减字符串
代码如下:
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)) {

         $t =ord($string[$n]);
         if ($t == 9 || $t == 10 || (32<= $t && $t <= 126)) {
            $tn = 1;
            $n++;
            $noc++;
         } elseif (194 <= $t&& $t <= 223) {
            $tn = 2;
            $n += 2;
            $noc += 2;
         } elseif (224 <= $t&& $t <= 239) {
            $tn = 3;
            $n += 3;
            $noc += 2;
         } elseif (240 <= $t&& $t <= 247) {
            $tn = 4;
            $n += 4;
            $noc += 2;
         } elseif (248 <= $t&& $t <= 251) {
            $tn = 5;
            $n += 5;
            $noc += 2;
         } elseif ($t == 252 || $t ==253) {
            $tn = 6;
            $n += 6;
            $noc += 2;
         } else {
            $n++;
         }

         if ($noc >= $length){
            break;
         }

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