Nonce - WordPress

Assign an arbitrary number that can only be used once to help secure user interaction on WordPress:

<?php $nonce= wp_create_nonce  ('my-nonce'); ?>
<a href='myplugin.php?_wpnonce=<?php echo $nonce ?>'> ...

php 
$nonce=$_REQUEST['_wpnonce'];
if (! wp_verify_nonce($nonce, 'my-nonce') ) die('Security check'); 
?>

http://codex.wordpress.org/Function_Reference/wp_verify_nonce

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