How can I show session array items in PHP

Question

How can I make something like this below work?

<?PHP

$_SESSION['signup_errors']['test1'];
$_SESSION['signup_errors']['test2'];
$_SESSION['signup_errors']['test3'];
$_SESSION['signup_errors']['test4'];

foreach ($_SESSION['signup_errors'] as $key => &$value) {
    echo $value;
}
?>

Warning: Invalid argument supplied for foreach()

Answer 1

知道了，这个示例中没有设置值。

Answer 2

您已经很接近了，但是您的设置行实际上并未分配任何值。

$_SESSION['signup_errors']['test1'] = 'value1';

Answer 3

It means you haven't assigned $_SESSION['signup_errors'] a value, meaning there were no errors I guess. You should put the following line above the error-checking code:

$_SESSION['signup_errors'] = array();

Answer 4

Since you are not actually assigning any values to the elements in the session array in that section of code, $_SESSION is not returned as an array, therefore the foreach is receiving an empty variable and throwing an error.

If you are seeing the error message " Invalid argument supplied for foreach() " and you know the session does contain values that you've set, make sure the session is started, using the php command session_start();

then you will be able to loop through the session array and see the key & their values