加密了一个字符串，在解密输出的数据含有 \x02\x02 例如 test\x02\x02
如何把\x02去掉还原成原本的字符串 test
去掉了还能解密吗？
去掉了还能解密吗？
是解密完以后 输出的数据带着\x02 设 $s 为解密后的串，则
$s = rtrim($s, "\x02");
设 $s 为解密后的串，则
$s = rtrim($s, "\x02");
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