[TOC]
1. 获取字符串长度
```
function strLength($string) {
$length = 0;
for ($i = 0; $i < strlen($string);) {
$ascNum = Ord($string{$i});
if ($ascNum >= 224) {
$length += 2;
$i += 3;
} elseif ($ascNum >= 192) {
$length += 2;
$i += 2;
} else {
$length += 1;
$i += 1;
}
}
return $length;
}
```
