Is it best practice to use header redirection before initializing session variables in PHP scripts?

It is not best practice to use header redirection before initializing session variables in PHP scripts because headers must be sent before any output is sent to the browser, including session variables. If session variables are initialized before the header redirection, it may cause errors or unexpected behavior. To solve this issue, always ensure that session variables are initialized before any header redirection is performed in PHP scripts. 

<?php
session_start();
// Initialize session variables here

// Perform header redirection after session variables are initialized
header("Location: example.php");
exit;
?>

Keywords

header redirection session variables PHP scripts initialization best practice

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