给你点启发,
utf-8和ansi编码算法不一样,下面是字符串截断函数
复制内容到剪贴板
代码:
function cutStr($string, $length, $dot = ' ...', $charset = 'utf-8')
{
if(strlen($string) <= $length) return $string;
$string = str_replace(array('&', '"', '<', '>'), array('&', '"', '<', '>'), $string);
$strcut = '';
if(strtolower($charset) == 'utf-8')
{
$n = $tn = $noc = 0;
while($n < strlen($string))
{
$t = ord($string[$n]);
if($t == 9 || $t == 10 || (32 <= $t && $t <= 126))
{
$tn = 1; $n++; $noc++;
}
elseif(194 <= $t && $t <= 223)
{
$tn = 2; $n += 2; $noc += 2;
}
elseif(224 <= $t && $t < 239)
{
$tn = 3; $n += 3; $noc += 2;
}
elseif(240 <= $t && $t <= 247)
{
$tn = 4; $n += 4; $noc += 2;
}
elseif(248 <= $t && $t <= 251)
{
$tn = 5; $n += 5; $noc += 2;
}
elseif($t == 252 || $t == 253)
{
$tn = 6; $n += 6; $noc += 2;
}
else
{
$n++;
}
if($noc >= $length) break;
}
if($noc > $length) $n -= $tn;
$strcut = substr($string, 0, $n);
}
else
{
for($i = 0; $i < $length - strlen($dot) - 1; $i++)
{
$strcut .= ord($string[$i]) > 127 ? $string[$i].$string[++$i] : $string[$i];
}
}
$strcut = str_replace(array('&', '"', '<', '>'), array('&', '"', '<', '>'), $strcut);
return $strcut.$dot;
}
