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session-关于PHP唯一表示符的问题。不懂，求讲解
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- 2016-06-02 11:32:171001browse
sessionphp表单
$_SESSION['uniqid']=$_uniqid=sha1(uniqid(rand(),true))；这个$_SESSION['uniqid']和$_uniqid这个不是必然相等吗。。为什么我看到他是判断$_SESSION['uniqid']和$_uniqid的值是不是一样的来判断是否是正常注册。
$_uniqid是表单中隐藏域的值
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