bbp_get_topic_subscribers( int $topic_id )

Get the users who have subscribed to the topic

Description

Parameters

$topic_id: (Optional) Topic id

Return

(array|bool) Results if the topic has any subscribers, otherwise false

Source

function bbp_get_topic_subscribers( $topic_id = 0 ) {
    $topic_id = bbp_get_topic_id( $topic_id );
    if ( empty( $topic_id ) )
        return;
 
    global $wpdb;
 
    $key   = $wpdb->prefix . '_bbp_subscriptions';
    $users = wp_cache_get( 'bbp_get_topic_subscribers_' . $topic_id, 'bbpress_users' );
    if ( false === $users ) {
        $users = $wpdb->get_col( "SELECT user_id FROM {$wpdb->usermeta} WHERE meta_key = '{$key}' and FIND_IN_SET('{$topic_id}', meta_value) > 0" );
        wp_cache_set( 'bbp_get_topic_subscribers_' . $topic_id, $users, 'bbpress_users' );
    }
 
    return apply_filters( 'bbp_get_topic_subscribers', $users );
}

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Changelog

Changelog
Version	Description
bbPress (r2668)	Introduced.

Uses

Uses
Uses	Description
bp-forums/topics/template.php: bbp_get_topic_id()	Return the topic id

Used By
Used By	Description
bp-forums/classes/class-bp-rest-topics-actions-endpoint.php: BP_REST_Topics_Actions_Endpoint::merge_item()	Merge Topic
bp-forums/classes/class-bp-rest-topics-actions-endpoint.php: BP_REST_Topics_Actions_Endpoint::split_item()	Split Topic
bp-forums/topics/functions.php: bbp_remove_topic_from_all_subscriptions()	Remove a deleted topic from all users’ subscriptions
bp-forums/topics/functions.php: bbp_merge_topic_handler()	Merge topic handler
bp-forums/topics/functions.php: bbp_split_topic_handler()	Split topic handler
bp-forums/common/functions.php: bbp_notify_topic_subscribers()	Sends notification emails for new replies to subscribed topics

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