How does PHP handle case sensitivity in variables, and why is it important when working with cookies?

PHP is case-sensitive when it comes to variables, meaning that $variable and $Variable are treated as two different variables. When working with cookies, it is important to be consistent with the case of variable names to ensure that the correct values are retrieved and set. 

// Setting a cookie with a consistent case
setcookie('username', 'JohnDoe', time() + 3600, '/');

// Retrieving a cookie with the same case
$username = $_COOKIE['username'];

Keywords

case sensitivity variables cookies importance handling

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