How to achieve PHP redirection without losing data?

#How does PHP redirection prevent data loss?

First get the data to be saved;

$data = [
	'username' => 'guanhuicoder',
	'redirect_url' => './index.php'
	'email' => 'guanhuicoder@code.com'
];

Then convert the data into a JSON string and store it in the Session;

$data = [
	'username' => 'guanhuicoder',
	'redirect_url' => './index.php'
	'email' => 'guanhuicoder@code.com'
];

$data = json_encode($data);

session_start();

$_SESSION['data'] = $data;

Then re- After orientation, take out and delete the data;

session_start();

$data = $_SESSION['data'];

unset($_SESSION['data']);

Finally, just decode the data into JSON.

$data = json_decode($data);

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