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修复题目导出 (problem_export_xml.php)： - 修复 `str_replace()` 中 "Passing null to parameter zhblue#3" 的废弃警告。 - 在 `fixcdata()` 函数中增加空值检查，如果内容为 null 则直接返回空字符串。 - 此修复防止了 XML 导出文件损坏，避免了 PHP 警告信息被错误地注入到 `remote_oj`/`remote_id` 标签中。
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还是复制问题。