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程序代码
cut_str(字符串,截取长度,开始长度,编码);
编码默认为 utf-8
开始长度默认为 0
<?Php
/***************************************************************************
* cut_string.Php
* ------------------------------
* Date : Jul 16,2005
* Copyright : none
* Mail :
*
* 作用:截取中文字符.
*
*
***************************************************************************/
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('',$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,2);
else $tmpstr.= substr($string,1);
}
if(ord(substr($string,1))>129) $i++;
}
if(strlen($tmpstr)<$strlen ) $tmpstr.= "...";
return $tmpstr;
}
}
'---------截取指定长度的utf8字符串------------
'////str:string 源字符串
'//count:Integer 指定长度? 一个汉字占三个字节,长度只能小,不能大
'//Result:string 截取后的utf8字符串
class function TPduPush.getUTF8String(Str: string; count: Integer): string;
var???? i,j: integer;????
??????? tmpChar: Pchar;
begin????
??????? tmpChar := pchar(str);???
??????? i := 0;????
??????? j := 0;???
??????? result := ’’;???
??????? while i < length(tmpChar) do begin?????
??????????? if j >= count then break;? //英文转码后不能超过指定的位数?????
??????????????? if ord(tmpChar) < $80 then begin????????????
??????????????????? result := result + string(tmpChar);???????????
??????????????????? i := i + 1;?????????????
??????????????????? j := j + 1;?????????
??????????????? end
??????????? else begin????
??????????????? if j + 2 >= count then break;? //汉字转码后不能超过指定的位数?????????????????????? result := result + string(tmpChar) + string(tmpChar[i + 1]);
??????????????????? i := i + 2;?????
??????????????????? j := j + 3;???????
??????????????? end;???
??????????? end;
end;
} （编辑：李大同）
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