转换字符全过程

function convertStr($str) {$strlength = strlen($str);$cstr = '';for($i = 0; $i < $strlength; $i++) {$cstr .= "%".strtoupper(base_convert(ord($str{$i}), 10, 16));}return $cstr;}$s = $_POST['w'];$contents = ($contentscharset = mb_detect_encoding($s, "ASCII, UTF-8, GB2312, GBK")) == "GB2312" ? $s : iconv($contentscharset, "CP936", $s);$w = convertStr($contents);