Get data from $_SESSION - php

Question

I'm trying to create simple server side validation, this is my method
public function create() {
$name = $_POST['name'];
session_start();
unset($_SESSION['errors']);
$count = $this->model->checkIfUserExists($name);
if($count > 0) {
$_SESSION['errors'] = array(
'message' => 'User Already Exists',
'variables' => array(
'name' => $_POST['name'],
'password' => $_POST['password'],
),
);
header('location: ' . URL . 'user/registration');
exit;
}
$data = array();
$data['name'] = $_POST['name'];
$data['password'] = $_POST['password'];
$this->model->create($data);
header('location: ' . URL);
}
and below code from registration.php
<?php
if (isset($_SESSION['errors']) && count($_SESSION['errors']) > 0) {
echo '<ul>';
foreach ($_SESSION['errors'] as $error) {
echo '<li>' . $error['message'] . '</li>';
}
echo '</ul>';
unset($_SESSION['errors']);
}
?>
but I got errors
Warning: Illegal string offset 'message' in C:\xampp\htdocs\test\views\user\registration.php on line 6
�
Notice: Undefined index: message in C:\xampp\htdocs\test\views\user\registration.php on line 6
How to fix it?

Answer 1

Generally, Warning: Illegal string offset ... means that you are trying to access a string as an array.
Currently, you are setting $_SESSION['errors'] to an associative array with two elements, message and variables. I believe what you are trying to achieve is to create an array with multiple errors that each have a message and variables.
Setting it like this should do:
...
$_SESSION['errors'] = array();
if ($count > 0) {
$_SESSION['errors'][] = array(
'message' = > 'User Already Exists',
'variables' = > array(
'name' = > $_POST['name'],
'password' = > $_POST['password'],
),
);
header('location: '.URL.'user/registration');
exit;
}
...
The empty square brackets add a new element to the array:
$myArray[] = $myNewElement;
This way you can easily add additional errors to the list:
$_SESSION['errors'][] = array(
'message' = > 'Error two',
'variables' = > array(...),
);
$_SESSION['errors'][] = array(
'message' = > 'Error three',
'variables' = > array(...),
);

Answer 2

It's because foreach goes throught items in main array. ["message", "variables"]
Assign $_SESSION['errors'] = like this: $_SESSION['errors'][] =
$_SESSION['errors'][] = array(
'message' => 'User Already Exists',
'variables' => array(
'name' => $_POST['name'],
'password' => $_POST['password'],
),
);

Answer 3

registration.php at first start session session_start()
<?php
session_start();
if (isset($_SESSION['errors']) && count($_SESSION['errors']) > 0) {
echo '<ul>';
foreach ($_SESSION['errors'] as $error) {
echo '<li>' . $error['message'] . '</li>';
}
echo '</ul>';
unset($_SESSION['errors']);
}
?>