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理解$val = !empty($_GET[$str]) ? $_GET[$str] : null;解决方案

WBOYOriginal: 2016-06-13 12:35:19888browse

理解$val = !empty($_GET[$str]) ? $_GET[$str] : null;
如何理解$val = !empty($_GET[$str]) ? $_GET[$str] : null;这句话

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------解决方案--------------------
它就是if else 的变形，下面这样应该能理解了吧

if(!empty($_GET[$str]))

   $val= $_GET[$str];

else

   $val = null;

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理解$val = !empty($_GET[$str]) ? $_GET[$str] : null;解决方案

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