字符串截取函数

Submitted by bbbbbb on Fri, 06/11/2010 - 13:50 
<?php
/**
 * utf-8、gb2312都支持的汉字截取函数
 *
 * @param string $string
 * @param integer $sublen
 * @param integer $start
 * @param string $code
 * @return string
 */

function cut_str($string,$sublen,$start=0,$code='UTF-8')
{
 if($code=='UTF-8')
 {
  $pa="/[x01-x7f]|[xc2-xdf][x80-xbf]|xe0[xa0-xbf][x80-xbf]|[xe1-xef][x80-xbf][x80-xbf]|xf0[x90-xbf][x80-xbf][x80-xbf]|[xf1-xf7][x80-xbf][x80-xbf][x80-xbf]/";
  preg_match_all($pa,$string,$t_string);

  if(count($t_string[0])-$start>$sublen) return join('',array_slice($t_string[0],$start,$sublen))."...";
  return join('',array_slice($t_string[0],$start,$sublen));
 }
 else
 {
  $start=$start*2;
  $sublen=$sublen*2;
  $strlen=strlen($string);
  $tmpstr='';

  for($i=0;$i<$strlen;$i++)
  {
   if($i>=$start&&$i<($start+$sublen))
   {
    if(ord(substr($string,$i,1))>129)
    {
     $tmpstr.=substr($string,$i,2);
    }
    else
    {
     $tmpstr.=substr($string,$i,1);
    }
   }
   if(ord(substr($string,$i,1))>129) $i++;
  }
  if(strlen($tmpstr)<$strlen ) $tmpstr.="...";
  return $tmpstr;
 }
}

$str="新程php培训";
echo cut_str($str,8,0,'gb2312');
?>
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