php smarty截取中文字符乱码问题?gb2312/utf-8
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php smarty截取中文字符乱码问题?gb2312/utf-8,
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一般网站页面的显示都不可避免的会涉及子字符串的截取,这个时候truncate就派上用场了,但是它只适合英文用户,对与中文用户来说,使用 truncate会出现乱码,而且对于中文英文混合串来说,截取同样个数的字符串,实际显示长度上却不同,视觉上会显得参差不齐,影像美观。这是因为一个中文的长度大致相当与两个英文的长度。此外,truncate也不能同时兼容GB2312,UTF-8等编码。
改良的smartTruncate: 文件名:modifier.smartTruncate.PHP
<div class="codetitle"><a style="CURSOR: pointer" data="67290" class="copybut" id="copybut67290" onclick="doCopy('code67290')"> 代码如下:
<div class="codebody" id="code67290">
<?
PHP function smartDetectUTF8($string)
{
static $result = array();
if(! array_key_exists($key = md5($string),$result))
{
$utf8 = "
/^(?:
[\x09\x0A\x0D\x20-\x7E] # ASCII
| [\xC2-\xDF][\x80-\xBF] # non-overlong 2-byte
| \xE0[\xA0-\xBF][\x80-\xBF] # excluding overlongs
| [\xE1-\xEC\xEE\xEF][\x80-\xBF]{2} # straight 3-byte
| \xED[\x80-\x9F][\x80-\xBF] # excluding surrogates
| \xF0[\x90-\xBF][\x80-\xBF]{2} # planes 1-3
| [\xF1-\xF3][\x80-\xBF]{3} # planes 4-15
| \xF4[\x80-\x8F][\x80-\xBF]{2} # plane 16
)+$/xs
";
$result[$key] = preg_match(trim($utf8),$string);
}
return $result[$key];
}
function smartStrlen($string)
{
$result = 0;
$number = smartDetectUTF8($string) ? 3 : 2;
for($i = 0; $i < strlen($string); $i += $bytes)
{
$bytes = ord(substr($string,$i,1)) > 127 ? $number : 1;
$result += $bytes > 1 ? 1.0 : 0.5;
}
return $result;
}
function smartSubstr($string,$start,$length = null)
{
$result = '';
$number = smartDetectUTF8($string) ? 3 : 2;
if($start < 0)
{
$start = max(smartStrlen($string) + $start,0);
}
for($i = 0; $i < strlen($string); $i += $bytes)
{
if($start <= 0)
{
break;
}
$bytes = ord(substr($string,1)) > 127 ? $number : 1;
$start -= $bytes > 1 ? 1.0 : 0.5;
}
if(is_null($length))
{
$result = substr($string,$i);
}
else
{
for($j = $i; $j < strlen($string); $j += $bytes)
{
if($length <= 0)
{
break;
}
if(($bytes = ord(substr($string,$j,1)) > 127 ? $number : 1) > 1)
{
if($length < 1.0)
{
break;
}
$result .= substr($string,$bytes);
$length -= 1.0;
}
else
{
$result .= substr($string,1);
$length -= 0.5;
}
}
}
return $result;
}
function smarty_modifier_smartTruncate($string,$length = 80,$etc = '...',
$break_words = false,$middle = false)
{
if ($length == 0)
return '';
if (smartStrlen($string) > $length) {
$length -= smartStrlen($etc);
if (!$break_words && !$middle) {
$string = preg_replace('/\s+?(\S+)?$/','',smartSubstr($string,$length+1));
}
if(!$middle) {
return smartSubstr($string,$length).$etc;
} else {
return smartSubstr($string,$length/2) . $etc . smartSubstr($string,-$length/2);
}
} else {
return $string;
}
}
?>
子字符串的时候不会出现参差不齐的情况.
:A中B华C.. (