太长的标题要截断?如何分别全角和半角以避免乱码

作 者: lemann(lemann) 2001.07.04 修改 删除 ★ 回复
China It Power . CombEkhRfcttqr6X9IpW63z1rCey
作者 rongya (-) 站内 WebDesign
China It Power . CombEkhRfcttqr6X9IpW63z1rCey
标题 Re: 太长的标题要截断?如何分别全角和半角以避免乱码
时间 Thu Mar 8 18:57:28 2001
China It Power . CombEkhRfcttqr6X9IpW63z1rCey
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China It Power . CombEkhRfcttqr6X9IpW63z1rCey

China It Power . CombEkhRfcttqr6X9IpW63z1rCey
function ChgTitle($title)
China It Power . CombEkhRfcttqr6X9IpW63z1rCey
{
China It Power . CombEkhRfcttqr6X9IpW63z1rCey

China It Power . CombEkhRfcttqr6X9IpW63z1rCey
$length = 46;
China It Power . CombEkhRfcttqr6X9IpW63z1rCey
if (strlen($title)>$length) {
China It Power . CombEkhRfcttqr6X9IpW63z1rCey
$temp = 0;
China It Power . CombEkhRfcttqr6X9IpW63z1rCey
for($i=0; $i<$length; $i++)
China It Power . CombEkhRfcttqr6X9IpW63z1rCey
if (ord($title[$i]) > 128)
China It Power . CombEkhRfcttqr6X9IpW63z1rCey
$temp++;
China It Power . CombEkhRfcttqr6X9IpW63z1rCey
if ($temp%2 == 0)
China It Power . CombEkhRfcttqr6X9IpW63z1rCey
$title = substr($title,0,$length)."...";
China It Power . CombEkhRfcttqr6X9IpW63z1rCey
else
China It Power . CombEkhRfcttqr6X9IpW63z1rCey
$title = substr($title,0,$length+1)."...";
China It Power . CombEkhRfcttqr6X9IpW63z1rCey
}
China It Power . CombEkhRfcttqr6X9IpW63z1rCey
return $title;
China It Power . CombEkhRfcttqr6X9IpW63z1rCey
}
China It Power . CombEkhRfcttqr6X9IpW63z1rCey

China It Power . CombEkhRfcttqr6X9IpW63z1rCey
原理就是截断一个字符，看看其ascII码是不是大于128，如果是，说明截断的是一个全角汉字，那么就退后一个截断。用$length控制长度
China It Power . CombEkhRfcttqr6X9IpW63z1rCey

China It Power . CombEkhRfcttqr6X9IpW63z1rCey
备注：循环判断字符串里面的 >128
China It Power . CombEkhRfcttqr6X9IpW63z1rCey
的字符个数，如果半角字符为偶数，则表示位置刚好为整个汉字，如果为奇数，则为半个汉字，需要取下一个字符
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