Shortcode For Unsubscribe Check Boxes

Hi All,

For those who are using Email Users and need to provide their subscribers with an option to unsubscribe, here is a code for a shortcode that can be used to create an unsubscribe link anywhere on the website. First, copy and paste the code below in your functions.php or a blank plugin, then place the shortcode [subscription] anywhere on the site (such as a new page and preferably a password protected section) you want the check boxes to appear. Remember to provide a link to the page in the footer of your mass emails and newsletters!

function email_users_opt_in_out(){
	
	save_post_if_submitted();
	$id = get_current_user_id();
	$notif = get_user_meta( $id, 'email_users_accept_notifications', true );
	$mass = get_user_meta( $id, 'email_users_accept_mass_emails', true );
	
	/*
	//This section for testin purposes
	echo '<p>'.$notif.'</p>';
	echo '<p>'.$mass.'</p>';
	*/
	
	if($notif == "true"){
		$notifications = "checked";	
	}else{
		$notifications = "";
	}
	
	/*
	//This section for testing purposes
	echo "<p>Notifications:</p>";
	echo "<p>".$notifications."</p>";
	*/
	
	if($mass == "true"){
		$mass_emails = "checked";
	}else{
		$mass_emails = "";
	}
	
	/*
	//This section for testing purposes
	echo "<p>Mass Emails:</p>";
	echo "<p>".$mass_emails."</p>";
	*/
	
	?>
<div class="opt-form-container">
<form id="new_post" name="new_post" method="post">
</table>

			<h3>Email Preferences</h3>

	<table class="form-table">
	<tbody>
		<tr>
			<th></th>
			<td>
            	<input type="hidden" id="user_id_number" name="user_id_number" value=<?php echo $id; ?>></input>
				<input type="checkbox"
						name="email_users_accept_notifications"
						id="email_users_accept_notifications"
						value="notifications"
						<?php echo $notifications;?> ></input>
				Accept to receive post or page notification emails<br/>
				<input type="checkbox"
						name="email_users_accept_mass_emails"
						id="email_users_accept_mass_emails"
						value="mass_emails"
						<?php echo $mass_emails;?> ></input>

				Accept to receive emails sent to multiple recipients (but still accept emails sent only to me)			</td>
		</tr>
	</tbody>
	</table>
    
    <?php //wp_nonce_field( 'wps-frontend-post' ); ?>

    <p align="right"><input type="submit" value="Save Changes" tabindex="6" id="submit" name="submit" /></p>
    
</form>
</div><!-- end of .opt-form-container -->
<?php

	}
add_shortcode( 'subscription', 'email_users_opt_in_out' );

function save_post_if_submitted() {
    if ( isset($_POST['email_users_accept_notifications']) ) {
		update_user_meta( $_POST['user_id_number'], 'email_users_accept_notifications', 'true' );
    }else{
		update_user_meta( $_POST['user_id_number'], 'email_users_accept_notifications', 'false' );
	}

    if ( isset($_POST['email_users_accept_mass_emails']) ) {
		update_user_meta( $_POST['user_id_number'], 'email_users_accept_mass_emails', 'true' );
    }else{
		update_user_meta( $_POST['user_id_number'], 'email_users_accept_mass_emails', 'false' );
	}

}