Content Notify contains a number of useful filters so that you can customise various aspects of the plugin. These are:

Function: Get User Subscriptions #

cn_get_user_subscriptions( $key )

Purpose: Retrieve all subscriptions for a given user ID or email address.

Example:
if ( class_exists( 'Content_Notify' ) ) {
if ( is_user_logged_in() ) {
echo "<p>You have: " . count( cn_get_user_subscriptions( get_current_user_id() ) ) . " subscriptions</p>"; }
}

Function: Check Single Subscription #

cn_subscription_single_check( $key, $post_id )

Purpose: Check if a user already has a subscription to this post/page/custom post type.

Example:
if ( class_exists( 'Content_Notify' ) ) {
if ( is_user_logged_in() && cn_subscription_single_check( get_current_user_id(), get_the_ID() ) ) {
echo "<p>You can only have one subscription for this post.</p>";
}
}

Filter: Alert Subject – Publish #

cn\alert\subject\publish

Purpose: Filter for the subject field when a publish status is used on any post type.
The $post object and $entry (details of the user’s subscription) are available to use.

Example:
function cn_filter_subject_publish( $subject, $post, $entry ) {
$subject = __( 'Alert: New ' . $post_type_name[0]['single'] . ' Published', 'content-notify' );
return $subject;
}
add_filter( 'cn\alert\subject\publish', 'cn_filter_subject_publish', 10, 3 );

Filter: Alert Subject – Update #

cn\alert\subject\update

Purpose: Filter for the subject field when an update status is used on any post type.
The $post object and $entry (details of the user’s subscription) are available to use.

Example:
function cn_filter_subject_update( $subject, $post, $entry ) {
$subject = __( 'Alert: ' . $post_type_name[0]['single'] . ' Updated', 'cn\alert\user\message' );
return $subject;
}
add_filter( 'cn\alert\subject\update', 'cn_filter_subject_update', 10, 3 );

Filter: Email HTML #

cn\alert\html

Purpose: Filter the HTML that Content Notify sends in an email.
Note: You can also customise the HTML email using a template file. Details of this can be found here.

Example:
function cn_filter_html( $email_html, $subject, $featured, $title, $message, $links, $sender_details ) {
$email_html = 'INSERT CONTENTS OF THE wp-content/plugins/content-notify/templates/alert-email.php FILE HERE';
return $email_html;
}
add_filter( 'cn\alert\html', 'cn_filter_html' );

Filter: User Alert Message #

cn\alert\user\message

Purpose: Filter for the message field used on any post type.

Example:
function cn_filter_user_message( $message ) {
if ( empty( $post->post_password ) ) {
$message = $post->post_content;
}
return $message;
}
add_filter( 'cn\alert\user\message', 'cn_filter_user_message' );

Filter: Admin Alert Message #

cn\alert\admin\message

Purpose: Filter for the message in the alert that is sent to the admin when a user verifies their subscription.

Example:
function cn_filter_admin_message( $message ) {
$message = "
<p>" . __( "Here's what they signed up for: ", 'content-notify' ) . "</p>
" . $message_name . "
" . $mesage_post_type . "
" . $message_status . "
" . $message_author . "
" . $message_terms . "
" . $message_keywords . "
<p class='btn-container'><a href='" . get_edit_post_link( $subscription['ID'], false ) . "' class='btn btn-primary'>" . __( 'View Subscription', 'content-notify' ) . "</a></p>
";
return $message;
}
add_filter( 'cn\alert\admin\message', 'cn_filter_admin_message' );