Filter OptinMonster campaigns loaded into WordPress by name

filter-om-campaigns-by-name.php

<?php

function filter_om_campaigns_by_name( $campaigns, $save ) {

	// Make sure this is the refresh request and that we have data.
	if ( ! isset( $campaigns->success ) && ! empty( $campaigns ) ) {

		// Loop through the campaigns
		foreach ( (array) $campaigns as $slug => $campaign ) {

			// If we don't have a title
			// OR title does not start with 'SOME PREFIX: '
			if ( ! isset( $campaign->title ) || 0 !== strpos( $campaign->title, 'SOME PREFIX: ') ) {

				// then we do NOT bring this into WordPress.
				unset( $campaigns->$slug );
			}
		}
	}

	return $campaigns;
}
add_filter( 'optin_monster_pre_store_options', 'filter_om_campaigns_by_name', 10, 2 );