php中文截取字串函數的執行個體教程

本節內容：
php中文截取字元竄函數

例子：

<?php/*** 中文字串截取函數* by www.jbxue.com*/function cut_str($string,$sublen,$filter=true,$start=0,$code='UTF-8'){ if($filter) $string=Html2Text($string); if($code=='UTF-8'){   $pa="/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|[\xe0-\xef][\x80-\xbf]{2}|[\xf0-\xff][\x80-\xbf]{3}/";  preg_match_all($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 $tmpstr; }}//html轉換函式function Html2Text($str){ $str = preg_replace("/<sty(.*)\\/style>|<scr(.*)\\/script>|<!--(.*)-->/isU","",$str); $alltext = ""; $start = 1; for($i=0;$i<strlen($str);$i++){  if($start==0 && $str[$i]==">"){   $start = 1;  }else if($start==1){   if($str[$i]=="<"){    $start = 0;    $alltext .= " ";   }else if(ord($str[$i])>31){    $alltext .= $str[$i];   }  } } $alltext = str_replace("　"," ",$alltext); $alltext = preg_replace("/&([^;&]*)(;|&)/","",$alltext); $alltext = preg_replace("/[ ]+/s"," ",$alltext);  return $alltext;}