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这句正确得怎么写啊总是出错

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2016-06-13 12:44:19961browse

这句正确得如何写啊?总是出错
header('Location:go.php?pic='. $mulu .''. $time .'x'. $userip . '.jpg');

这句正确得如何写啊?总是出错。。。php就是晕啊。。好多的.和’究竟得怎样区分??

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