"Warning: Cannot modify header information - headers already sent by (output started at file_path:line)"
- 原因：嘗試修改HTTP頭資訊，但已有內容輸出。
- 解決方法：確保在任何輸出前設定HTTP頭資訊，檢查是否有空白字元或註釋提前輸出。
Warning: Cannot modify header information - headers already sent by (output started at file_path:line)
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