/**
* utf-8中文截取，單字節(jié)截取模式
*
* @access public
* @param string $str 需要截取的字符串
* @param int $slen 截取的長(zhǎng)度
* @param int $startdd 開始標(biāo)記處
* @return string
*/
if ( ! function_exists('cn_substr_utf8')) {
function cn_substr_utf8($str, $length, $start=0) {
if(strlen($str) < $start+1) {
return '';
}
preg_match_all("/./su", $str, $ar);
$str = '';
$tstr = '';
</p> <p> //為了兼容mysql4.1以下版本,與數(shù)據(jù)庫(kù)varchar一致,這里使用按字節(jié)截取
for ($i=0; isset($ar[0][$i]); $i++) {
if(strlen($tstr) < $start) {
$tstr .= $ar[0][$i];
} else {
if(strlen($str) < $length + strlen($ar[0][$i]) ) {
$str .= $ar[0][$i];
} else {
break;
}
}
}
return $str;
}
}

if(strlen($str) < $length + strlen($ar[0][$i]) )

if(strlen($str) < $length + strlen($ar[0][$i]) -1 )

$f = "你好fasdfa你fasdf#e#";
$pos = strpos($f,'#e#');
var_dump($pos);
var_dump(cn_substr_utf8($f,$pos));
var_dump(cn_substr_utf82($f,$pos));
</p> <p>function cn_substr($str, $slen, $startdd=0) {
global $cfg_soft_lang;
if($cfg_soft_lang=='utf-8') {
return cn_substr_utf8($str, $slen, $startdd);
}
$restr = '';
$c = '';
$str_len = strlen($str);
if($str_len < $startdd+1) {
return '';
}
if($str_len < $startdd + $slen || $slen==0) {
$slen = $str_len - $startdd;
}
$enddd = $startdd + $slen - 1;
for ($i=0;$i<$str_len;$i++) {
if($startdd==0) {