What is the default value of a session variable?

<?php
session_start();  
if(isset($_SESSION['views']))
    $_SESSION['views'] = $_SESSION['views']+ 1;
else
    $_SESSION['views'] = 1;

echo "views = ". $_SESSION['views']; 
?>

Is $_SESSION['views'] initialized as FALSE?

EDIT: I meant the third line of code:

if(iss开发者_运维百科et($_SESSION['views']))

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There is nothing special with $_SESSION['views']. $_SESSION is a "normal" array. If you don't set anything, views is just an undefined array index.

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It's initialised as 1, because you told it to be.

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$_SESSION['views'] is initialized as whatever you set it as. According to your example, it would be initialized as 1 or TRUE.

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If I understand correctly, it's like this: if the user has never been to your site, then you are starting a new session and $_SESSION['views'] will not be set (so you set it to 1). On the other hand if the user's request comes with a session ID of a valid session, then the variable will be set to whatever it was last stored as.