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md5-有关php上传文件名唯一确定，防止同名覆盖

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Release： 2016-06-02 11:32:42
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phpmd5

$uniName=md5(uniqid(microtime(ture),true)).'.'.$ext;
$ext是文件类型。请问这句语句是什么意思，谢谢大神！希望可以详细点

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php md5
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