Because the standard input and the standard output of the remote command are tied to your keyboard and display, albeit through the magic of SSH.
这是因为远程命令的标准输入和标准输出都绑定到了您的键盘和显示器，这正是SSH的神奇之处。
PHP wasn't originally designed to be used with direct keyboard input or text output to the user.
PHP最初不是设计用于与用户直接的键盘输入或文本输出结合使用。
Mouse or keyboard events must always produce the same output.
鼠标或者键盘事件必须显示相同的输出结果。
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