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PHP字符串截取

来源: www.dedecms8.com 编辑:织梦吧 时间:2012-02-07点击:
   

 

  /**

  * 字符截取 支持UTF8/GBK

  * @param $string

  * @param $length

  * @param $dot

  */

  function str_cut($string, $length, $dot = '...') {

  $strlen = strlen($string);

  if($strlen <= $length) return $string;

  $string = str_replace(array(' ',' ', '&', '"', ''', '“', '”', '—', '<', '>', '·', '…'), array('∵',' ', '&', '"', "'", '“', '”', '—', '<', '>', '·', '…'), $string);

  $strcut = '';

  if(strtolower(CHARSET) == 'utf-8') {

  $length = intval($length-strlen($dot)-$length/3);

  $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);

  $strcut = str_replace(array('∵', '&', '"', "'", '“', '”', '—', '<', '>', '·', '…'), array(' ', '&', '"', ''', '“', '”', '—', '<', '>', '·', '…'), $strcut);

  } else {

  $dotlen = strlen($dot);

  $maxi = $length - $dotlen - 1;

  $current_str = '';

  $search_arr = array('&',' ', '"', "'", '“', '”', '—', '<', '>', '·', '…','∵');

  $replace_arr = array('&',' ', '"', ''', '“', '”', '—', '<', '>', '·', '…',' ');

  $search_flip = array_flip($search_arr);

  for ($i = 0; $i < $maxi; $i++) {

  $current_str = ord($string[$i]) > 127 ? $string[$i].$string[++$i] : $string[$i];

  if (in_array($current_str, $search_arr)) {

  $key = $search_flip[$current_str];

  $current_str = str_replace($search_arr[$key], $replace_arr[$key], $current_str);

  }

  $strcut .= $current_str;

  }

  }

  return $strcut.$dot;

  }

标签: php 字符串 截取

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