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The login_init hook in WordPress is an action hook that is triggered during the initialization of the login process. It is fired before any authentication or login-related actions take place.

This hook allows developers to perform custom actions or modify the login process before it proceeds further. It can be used to add additional security measures, customize the login page, or perform any other actions required during the authentication process.

Here’s an example of how you can use the login_init hook to add a custom message to the login page:

function custom_login_message() {
    echo '<p>Welcome to our website!</p>';
add_action('login_init', 'custom_login_message');

In this example, we define a custom function custom_login_message() that echoes a welcome message on the login page. We then use the add_action() function to attach this function to the login_init hook. Now, whenever the login process is initialized, our custom message will be displayed on the login page.

Remember, the login_init hook provides a way to customize the login process, but be cautious when making changes that may affect the security or usability of the WordPress login system. Always test thoroughly and adhere to best practices when using this hook.

Learn More on WordPress.org

WordPress snippets using the login_init hook

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