PHP在执行exec()方法时，会等待exec方法完全执行完之后才会继续执行其余代码
而exec()会执行很长时间，这样的话页面就会一直处于等待状态，
等exec执行完之后才会刷新，
所以有没有某种方法可以使exec在后台执行的同时，让页面不用等待exec执行完毕就刷新？
回复讨论(解决方案)
尝试在被执行的指令后面加个 &
但并不是所用命令都可以在后台执行的
尝试在被执行的指令后面加个 &
但并不是所用命令都可以在后台执行的
试了，不行
页面上有个按钮，
1.点击后更新DB
2.DB更新后页面刷新
3.当页面onload的时候用AJAX执行后台一个方法，这个方法的作用是向服务器2发送一个HTTP请求
4.当服务器2接收到3的请求后，执行exec方法，该方法执行服务器2目录下的一个bat文件（里面是Java的jar包）
因为4运行的时间过长，所以就产生了一个帖子。。。
这个貌似不可以，你可以在服务器端弄个事件队列，当服务器2接收到3的请求后就加一个事件进去，在服务器2上面写一个处理事件程序。
看到这个，就可以体会到基于事件处理语言的好处了。。
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