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@edvakf edvakf/gist:8434738
Created Jan 15, 2014

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* 想定する文字列(UCS2)かどうか
* (parse_strした結果に適用される)
private static function isValidString($str)
if (mb_strlen($str, 'UTF-8') > self::MAX_DETAIL_CHAR_LENGTH) {
return false;
$ucs2 = mb_convert_encoding($str, 'UCS-2', 'UTF-8');
$utf8 = mb_convert_encoding($ucs2, 'UTF-8', 'UCS-2');
if ($str !== $utf8) {
return false;
return true;
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