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('',$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,2);
??? }else{
???? $tmpstr .= substr($string,1);
??? }
?? }
?? if(ord(substr($string,1))>129){
??? $i++;
?? }
?? if(strlen($tmpstr)<$strlen){
??? $tmpstr .= "...";
?? }
? }
? return $tmpstr;
?}
}
$string ="顶置车顶起困境上盯协押畏奇才趄肯困楞右脚可爱有";
echo substr_zh($string,10,'gb2312');
?>