Sends the first campaign of a drip campaign

send_first_pregnancy_campaing

add_action( 'mailster_subscriber_subscribed', 'send_first_pregnancy_campaing' );
function send_first_pregnancy_campaing( $subscriber_id ) {

	//get subscriber
	if ( $subscriber = mailster( 'subscribers' )->get( $subscriber_id ) ) {

		$seachstring = "Pregnancy week %d";
		$total_weeks = 40;

		//no birthdate
		if ( !$subscriber->birthdate ) return;

		$birthdate = strtotime( $subscriber->birthdate );
		$diff = $birthdate-time();
		$diff_in_weeks = $diff/60/60/24/7;
		$pregnancy_week = floor( $total_weeks-$diff_in_weeks );

		// birthdate reached or passed
		if($pregnancy_week > $total_weeks) return;

		//search for n autoresponder with the current week
		if ( $campaigns = mailster( 'campaigns' )->get_autoresponder( array( 's' => sprintf( $seachstring, $pregnancy_week ) ) ) ) {

			$campaign = $campaigns[0];

			//send campaign
			mailster( 'campaigns' )->send_to_subscriber( $campaign->ID, $subscriber->ID );

		}else {
			//no campaign found
		}

	}

}