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修复了 array_reduce() 函数使用时可能引发的警告问题。原代码中,$posts 变量可能为 null 或未定义,直接将其传递给 array_reduce() 会导致 PHP 抛出警告信息。为了增强代码的健壮性,添加了对 $posts 的检查逻辑,确保其已设置且为数组后再执行 array_reduce() 操作。