login_form_{$action}

The dynamic portion of the hook name, $action, refers to the action that brought the visitor to the login form. Possible hook names include:

• login_form_checkemail
• login_form_confirm_admin_email
• login_form_confirmaction
• login_form_entered_recovery_mode
• login_form_login
• login_form_logout
• login_form_lostpassword
• login_form_postpass
• login_form_register
• login_form_resetpass
• login_form_retrievepassword
• login_form_rp

// rejestracja funkcji zwrotnej
add_action( 'login_form_{$action}', 'twoja_funkcja' );

function twoja_funkcja($param_1) {
	// Twój kod
}