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帮小弟我解释一句代码

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Release: 2016-06-13 13:23:35
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帮我解释一句代码
$str = (isset($_POST['source']) ? $_POST['source'] : '');
这句话怎么理解啊。其中的问号和冒号又分别起什么作用啊。麻烦
大神们指点下。我找资料没找到。
其中source来自于

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