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PHP如何固定随机出号几分钟时间再变

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Release： 2016-06-13 12:14:20
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PHP怎么固定随机出号几分钟时间再变？

/* 生成随机数 */<br />function randKeys($len=5){<br />	$str='0123456789';<br />	$rand='';<br />	for($x=0;$x<$len;$x++){<br />		$rand.=($rand!=''?',':'').substr($str,rand(0,strlen($str)-1),1);<br />	}<br />	return $rand;<br />}
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上面代码是用来网页显示5个数字，只要网页一刷新数字就变了，能不能固定8分钟内刷新网页数字不变？请问代码怎么写？
------解决思路----------------------
如果考虑到更换浏览器的话，要么就是持久化存储，要么就存memcache吧
加上生成时间判断时间差大于8分钟更新就好了
------解决思路----------------------
时间戳做随机种子，可以通过算法保证在X分钟内的种子是一致的。

至于不同用户不同，再加上sessionid就不怕出问题了
------解决思路----------------------
session加IP
------解决思路----------------------
将固定的随机数放到数组中也是可以的，至于时间的设定，可以用js的定时器完成，定时请求一个ajax的方法，这个方法去php页面数组中拿数字

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source：php.cn
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