/**
*
* 中英混合字符串长度判断
* @param unknown_type $str
* @param unknown_type $charset
*/
function strLength($str, $charset = 'utf-8') {
if ($charset == 'utf-8')
$str = iconv ( 'utf-8', 'gb2312', $str );
$num = strlen ( $str );
$cnNum = 0;
for($i = 0; $i < $num; $i ++) {
if (ord ( substr ( $str, $i + 1, 1 ) ) > 127) {
$cnNum ++;
$i ++;
}
}
$enNum = $num - ($cnNum * 2);
$number = ($enNum / 2) + $cnNum;
return ceil ( $number );
}/**
*
* 中英混合的字符串截取
* @param unknown_type $sourcestr
* @param unknown_type $cutlength
*/
function cut_str($sourcestr, $cutlength) {
$returnstr = '';
$i = 0;
$n = 0;
$str_length = strlen ( $sourcestr ); //字符串的字节数
while ( ($n < $cutlength) and ($i <= $str_length) ) {
$temp_str = substr ( $sourcestr, $i, 1 );
$ascnum = Ord ( $temp_str ); //得到字符串中第$i位字符的ascii码
if ($ascnum >= 224) //如果ASCII位高与224，
{
$returnstr = $returnstr . substr ( $sourcestr, $i, 3 ); //根据UTF-8编码规范，将3个连续的字符计为单个字符
$i = $i + 3; //实际Byte计为3
$n ++; //字串长度计1
} elseif ($ascnum >= 192) //如果ASCII位高与192，
{
$returnstr = $returnstr . substr ( $sourcestr, $i, 2 ); //根据UTF-8编码规范，将2个连续的字符计为单个字符
$i = $i + 2; //实际Byte计为2
$n ++; //字串长度计1
} elseif ($ascnum >= 65 && $ascnum <= 90) //如果是大写字母，
{
$returnstr = $returnstr . substr ( $sourcestr, $i, 1 );
$i = $i + 1; //实际的Byte数仍计1个
$n ++; //但考虑整体美观，大写字母计成一个高位字符
} else //其他情况下，包括小写字母和半角标点符号，
{
$returnstr = $returnstr . substr ( $sourcestr, $i, 1 );
$i = $i + 1; //实际的Byte数计1个
$n = $n + 0.5; //小写字母和半角标点等与半个高位字符宽...
}
}
if ($str_length > $cutlength) {
$returnstr = $returnstr . "..."; //超过长度时在尾处加上省略号
}
return $returnstr;
}
