字符串长度
null Core_Str::strlen( [ $encoding $encoding = string(5) "utf-8" ] )
参数列表 参数 类型 描述 默认值 $encoding $encoding 字符编码,默认utf-8 string(5) "utf-8"
$encoding
public function strlen($encoding = 'utf-8') { return mb_strlen($this->data, $encoding); }