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function filter_blog_activity_by_category( $a, $activities ) {
	global $bp; 
	
	if ( is_site_admin() )
		return $activities;	
	
	foreach ( $activities->activities as $key => $activity ) {
		if ( $activity->component == 'blogs' ) {
			$blog_id = $activity->item_id;
			$post_id = $activity->secondary_item_id;
			switch_to_blog( $blog_id );
			// Pull up the post using $post_id and get_post()
			// Get the categories with get_the_category()
			// If the post is in the excluded categories, then
				unset( $activities->activities[$key] );
			restore_current_blog();
		}
	}
			
	/* Renumber the array keys to account for missing items */
	$activities_new = array_values( $activities->activities );
	$activities->activities = $activities_new;
	return $activities;
}
add_action( 'bp_has_activities', 'filter_blog_activity_by_category', 10, 2 );

1	-
1	+	function filter_blog_activity_by_category( $a, $activities ) {
2		global $bp;
3
4		if ( is_site_admin() )
5		return $activities;
6
7		foreach ( $activities->activities as $key => $activity ) {
8		if ( $activity->component == 'blogs' ) {
9		$blog_id = $activity->item_id;
10		$post_id = $activity->secondary_item_id;
11		switch_to_blog( $blog_id );
12		// Pull up the post using $post_id and get_post()
13		// Get the categories with get_the_category()
14		// If the post is in the excluded categories, then
15		unset( $activities->activities[$key] );
16		restore_current_blog();
17		}
18		}
19
20		/* Renumber the array keys to account for missing items */
21		$activities_new = array_values( $activities->activities );
22		$activities->activities = $activities_new;
23		return $activities;
24		}
25		add_action( 'bp_has_activities', 'filter_blog_activity_by_category', 10, 2 );