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PHP字符串截取

程序员文章站 2022-05-14 23:41:22
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  /**

  * 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

  $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

  $t = ord($string[$n]);

  if($t == 9 $t == 10 (32

  $tn = 1; $n++; $noc++;

  } elseif(194

  $tn = 2; $n += 2; $noc += 2;

  } elseif(224

  $tn = 3; $n += 3; $noc += 2;

  } elseif(240

  $tn = 4; $n += 4; $noc += 2;

  } elseif(248

  $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

  $current_str = ord($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;

  }