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php怎么实现刷新当前页面返回上一页

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Release： 2016-06-13 13:31:54
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php如何实现刷新当前页面返回上一页？
用php写的小程序，没有做缓存什么的。直接和html混编的。
每刷新一次页面都会对数据库查询一次。
所以我想实现刷新当前的页面直接返回上一页

------解决方案--------------------
echo "window.location.href=history.go(-1)";
?>

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