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关于赋值和判断语句的有关问题

WBOY
WBOYOriginal
2016-06-13 12:43:371041browse

关于赋值和判断语句的问题

<br />
 if ($userName=="system"){<br />
    $userName_msg="自动";<br />
 }else{<br />
   $userName_msg="";<br />
 }<br />

和
<br />
 $userName_msg="";<br />
 if($userName=="system"){<br />
    $userName_msg="自动";<br />
 }<br />

我想要给变量$userName_msg 赋值，上边两种写法有什么差别吗？

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