UTF-8 GBK下PHP获取字符串长度，是langwan写的，贴过来大家分享，完美的解决了PHP下获取UTF-8或者GBK字符集的字符串长度问题！

/*

* 统计字符串长度
*@author langwan
*@param $str 被统计字符串

*/

function sstrlen($str) {
global $charset;
$n = 0; $p = 0; $c = ”;
$len = strlen($str);
if($charset == ‘utf-8′) {
for($i = 0; $i < $len; $i++) {
$c = ord($str{$i});
if($c > 252) {
$p = 5;
} elseif($c > 248) {
$p = 4;
} elseif($c > 240) {
$p = 3;
} elseif($c > 224) {
$p = 2;
} elseif($c > 192) {
$p = 1;
} else {
$p = 0;
}
$i+=$p;$n++;
}
} else {
for($i = 0; $i < $len; $i++) {
$c = ord($str{$i});
if($c > 127) {
$p = 1;
} else {
$p = 0;
}
$i+=$p;$n++;
}
}

return $n;
}

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