html - Is it safe to only redirect non logged users on php? -

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i'm creating little website , i'm wondering since had lessons on http headers if it's safe use such logging algorithm :

if(! isset($_session["user"]) {    header("location : logout.php");    }    // , here start web page if conditin above not satisfied    <html> ........

i think it's not because redirection can ignored web client isn't ?

its better add 'else' statement prevent bugs trolling :)

if(!isset($_session["user"]) {      header("location : logout.php");     exit("you not authorized!");  } else { ?>    <html>...</html> <?php } ?>

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