php截取中文字符串函数实例

<?php

//中文字符串截取

function substr_zh($string,$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))."...";

   //array_slice()在数组中根据条件取出一段值，参数(数组,开始位置,[长度])

  }else{

   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){

    //ord():返回字符串第一个字符的ASCII值

    //substr():返回字符串的一部分

     $tmpstr .= substr($string,$i,2);

    }else{

     $tmpstr .= substr($string,$i,1);

    }

   }

   if(ord(substr($string,$i,1))>129){

    $i++;

   }

   if(strlen($tmpstr)<$strlen){

    $tmpstr .= "...";

   }

  }

  return $tmpstr;

 }

}

$string ="顶置车顶起困境檲上盯协押畏奇才趄肯困楞右脚可爱有";

echo substr_zh($string,10,0,'gb2312');

?>