how to allow the user not another user edit there profile?

[rallokkcaz]

i wanna to allow only the user who's info
is on the page to edit it

example

user1 can edit there profile

and user2 can't how could i make a code to do that

[SharkBait]

If the user is logged in, check to make sure that the user who is currently logged in matches that of the profile.

IE
[code]
<?php
$USERNAME = "SharkBait";

$USER = "SharkBait";  // Retrieved from a database

if($USERNAME == $USER) {
  // Allow user to edit profile
} else {
  // User is not allowed to edit profile
  echo "<p>You are unauthorized to do that action.</p>\n";
}

?>
[/code]