php 截取指定長度字串的代碼分享

來源:互聯網
上載者:User
分享一個截取指定長度字串的函數,可以對字串指定要截取的長度,並可以設定超出部分的顯示內容,很不錯,值得借鑒與學習。

根據中文裁減字串,截取指定長度的字串內容。

代碼如下:

'),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 >= $length){            break;         }     }      if ($noc> $length) {         $n -= $tn;     }      $strcut =substr($string, 0, $n);  } else {      for ($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;}?>
  • 聯繫我們

    該頁面正文內容均來源於網絡整理,並不代表阿里雲官方的觀點,該頁面所提到的產品和服務也與阿里云無關,如果該頁面內容對您造成了困擾,歡迎寫郵件給我們,收到郵件我們將在5個工作日內處理。

    如果您發現本社區中有涉嫌抄襲的內容,歡迎發送郵件至: info-contact@alibabacloud.com 進行舉報並提供相關證據,工作人員會在 5 個工作天內聯絡您,一經查實,本站將立刻刪除涉嫌侵權內容。

    A Free Trial That Lets You Build Big!

    Start building with 50+ products and up to 12 months usage for Elastic Compute Service

    • Sales Support

      1 on 1 presale consultation

    • After-Sales Support

      24/7 Technical Support 6 Free Tickets per Quarter Faster Response

    • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.