php中文截取字符窜函数
例子:
<?php /** * 中文 字符串截取 函数 * 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 $tmpstr; } } //html转换函数 function Html2Text($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; }
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