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我成功发送推送通知，但某些字符未正确呈现。
例如我发送这个词
情人节
但它在通知消息中呈现不同，它看起来像这样
瓦伦丁2019s
我使用 PHP 发送推送通知，什么是确保消息干净利落的最佳方式？
I need to sort an ArrayList and i can't use Collections.sort(), because Google App Engine's Java runtime environment doesn't support it. How can I do? Thank