我现在将给出Asp Code of C＃如何在PHP中修改和使用这段代码取决于你，但问题是一样的，所以我认为可能会有所了解。

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如何禁用浏览器后退和刷新按钮 [ ^ ]

I am going to give Asp Code of C# now how to modify and use this code in PHP that's depends on you but problem is same so i think might get idea.
Check this link
how to disable browser back and refresh buttons[^]