php empty和isset区别

文章描述:

php判断变量是否为空,如果不为空设置默认值

 

 

isset()

判断变量是否被赋值

$user['username'] = 'admin';
//echo $user['username'];

$username = isset($user['username']) ? $user['username'] : "默认用户名";
echo $username; 

 

empty()

判断一个已经被赋值的变量是否为空


$user['username'] = 'admin';
$username = !empty($user['username']) ? $user['username'] :'默认';

echo $username;

 

 

发布时间:2023/10/28

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