Hướng dẫn một số bảo mật trong wordpress

add_filter('the_generator', 'wpbeginner_remove_version');
function wpbeginner_remove_version(){
	return '';
}

< ?php
/*
The nonce is generated based on the current time, the $action argument, and the current user ID.
In this simple example, we create an nonce and use it as one of the GET query parameters in a URL for a link.
When the user clicks the link they are directed to a page where a certain action will be performed (for example, a post might be deleted).
On the target page the nonce is verified to insure that the request was valid (this user really clicked the link and really wants to perform this action).
*/ 
// Create an nonce for a link.
// We pass it as a GET parameter.
// The target page will perform some action based on the 'do_something' parameter.
$nonce = wp_create_nonce( 'my-nonce' );
?>
<a href='myplugin.php?do_something=some_action&_wpnonce=<?php echo $nonce; ?>'>Do some action</a>
 
< ?php 
// This code would go in the target page.
// We need to verify the nonce.
$nonce = $_REQUEST['_wpnonce'];
if ( ! wp_verify_nonce( $nonce, 'my-nonce' ) ) {
    // This nonce is not valid.
    die( 'Security check' ); 
} else {
    // The nonce was valid.
    // Do stuff here.
}
?>
< ?php
//For example, if we were to create an nonce that would be part of a request to delete a post, we might call it 'delete_post'. Then to make it more specific, we could append the ID of the particular post that the nonce was for. For example 'delete_post-5' for the post with ID 5.
wp_create_nonce( 'delete_post-' . $post_id );
 
//Then we would verify the nonce like this:
wp_verify_nonce( $nonce, 'delete_post-' . $_REQUEST['post_id'] );
?>

//nếu truy cập trực tiếp vào file của plugin sẽ k có biến wp
if(!defined('ABSPATH')) exit('hacked :D');