Create and Send Campaign Using Mailchimp API

<?php

//Include MailChimp API version 3 Class Library
include('mcv3/src/MailChimp.php');

use \DrewM\MailChimp\MailChimp;
$MailChimp = new MailChimp('<MAILCHIMP-API-KEY-HERE>');

//create campaign at Mailchimp
$result = $MailChimp->post('campaigns', array(
            "type" => 'regular',
            "recipients" => array(
                "list_id" => "<LIST-ID-HERE>",
                "segment_opts" => array(
                    "match" => "any",
                    "conditions" => array(
                        array("field" => "interests-<INTEREST-GROUP-ID-HERE>", "op" => "interestcontains", "value" => ["<INTEREST-ID-HERE>"])
                    ),
                )
            ),
            'settings' => array(
                'subject_line' => '<CAMPAIGN-SUBJECT-HERE>',
                'title' => '<CAMPAIGN-NAME-HERE>',
                'from_name' => '<FROM-NAME-HERE>',
                'reply_to' => '<FROM-EMAIL-ID-HERE>',
                'auto_footer' => false
            ),
            'content' => array('url' => $emailerpath),
        ));
        $campaign_id = $result['id'];

        //sleep for Sometime
        sleep(20);

//put content to campaign
        $contentx = json_encode($MailChimp->put('/campaigns/' . $campaign_id . '/content', array('url' => $emailerpath)
        ));

        //sleep for Sometime
        sleep(20);

//send email to list
        echo json_encode($MailChimp->post('/campaigns/' . $campaign_id . '/actions/send'));

?>