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The precedence of values is important in this case. Declaring an index in $_COOKIE, $_POST, and
$_GET with the same name could cause confusion for new developers. $_REQUEST causes $_COOKIE to
override both $_POST and $_GET. If $_COOKIE does not contain the variable name, $_POST will override
$_GET. For example, if you set the action attribute to test.php?username=agetvariable, you won’t see any
change in the username value because $_POST will override $_GET, even if the username field is left blank