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理解$val = !empty($_GET[$str]) ? $_GET[$str] : null;
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- 2016-06-23 14:24:271228browse
如何理解$val = !empty($_GET[$str]) ? $_GET[$str] : null;这句话
回复讨论(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;
三元表达式
$val = !empty($_GET[$str]) ? $_GET[$str] : null;
如果$_GET[$str]非空（不为空值），那么$val=$_GET[$str];
反之$val=null;
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