无法在多维数组中回显字符串但可以print_r

问题描述：

I've run into a weird problem, I can print_r() my variable and it produces the following:

print_r($_SESSION['userdata']);

outputs: Array ( [0] => Array ( [id] => 1 [username] => admin [firstname] => carl [lastname] => wirkus [password] => password [admin] => 1 [staff] => 0 [tenant] => 0 [email] => test@test.com )

However when I try to echo the username with:

echo "You are currently logged in as: " . $_SESSION['userdata']['username'] . "<br>";

outputs: You are currently logged in as:

What have I done wrong?

我遇到了一个奇怪的问题，我可以print_r（） code>我的变量和它产生以下内容： p>

  print_r（$ _ SESSION ['userdata']）; 
 
outputs：Array（[0] =＆gt; Array（[id] =＆gt;  ; 1 [用户名] =＆gt; admin [firstname] =＆gt; carl [lastname] =＆gt; wirkus [密码] =＆gt;密码[admin] =＆gt; 1 [staff] =＆gt; 0 [租户] =＆gt;  0 [email] =＆gt; test@test.com）
  code>  pre> 
 
 但是当我尝试用以下内容回显用户名时： p> 
 
 
  echo“您当前登录时为：”。$ _SESSION ['userdata'] ['username']。“＆lt; br＆gt;”; 
 
outputs：您当前登录为：
   pre> 
 
 我做错了什么？ p> 
  div>

答

Looks closer at your print_r($_SESSION['userdata']);. It's an array inside of an array. So you're not going deep enough to reach your values.

echo "You are currently logged in as: " . $_SESSION['userdata'][0]['username'] . "<br>";

无法在多维数组中回显字符串但可以print_r

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