mc.php

<?php

$mc_apikey = 'xxx';
$request_url = 'https://us13.api.mailchimp.com/3.0/lists/ccea54209d/members/?offset=%s&count=%s';
$offset = 0;
$count = 200;

$ch = curl_init();
curl_setopt($ch, CURLOPT_HTTPHEADER, array(
    'Content-Type: application/json',
    'Authorization: user ' . $mc_apikey));
curl_setopt($ch, CURLOPT_USERAGENT, 'PHP-MCAPI/3.0');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_TIMEOUT, 10);
$mcount = 1;
while (1) {

    $t_url = sprintf($request_url, $offset, $count);
    curl_setopt($ch, CURLOPT_URL, $t_url);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    $result = json_decode(curl_exec($ch));

    foreach ($result->members as $member) {
        if (empty($member->merge_fields->RDOB) && empty($member->merge_fields->RDOB2)) {
            continue;
        }

        $diff1 = 367;
        $diff2 = 367;

        if (!empty($member->merge_fields->RDOB)) {
            $now = new DateTime();
            $dob = new DateTime($member->merge_fields->RDOB);
            $birthday = new DateTime();
            $birthday->setDate($now->format('Y'), $dob->format('m'), $dob->format('d'));

            $diff1 = $now->diff($birthday)->format("%a");
            $age1 = $now->diff($dob)->y + 1;
        }
        if (!empty($member->merge_fields->RDOB2)) {
            $now = new DateTime();
            $dob = new DateTime($member->merge_fields->RDOB2);
            $birthday = new DateTime();
            $birthday->setDate($now->format('Y'), $dob->format('m'), $dob->format('d'));

            $diff2 = $now->diff($birthday)->format("%a");
            $age2 = $now->diff($dob)->y + 1;
        }
        $diff = min($diff1, $diff2);
        if ($diff == $diff1)
            $age = $age1;
        else
            $age = $age2;

//        echo "MIGHT update $member->email_address to ACTION bday$diff\n";

        if ($diff == 367)
            continue;

        $data = array(
                'email_address' => $member->email_address,
                'merge_fields'  => array(
                    'ACTION' => 'bday' . $diff . '-' . $age,
                )
        );
        $chupd = curl_init();
        curl_setopt($chupd, CURLOPT_URL, 'https://us13.api.mailchimp.com/3.0/lists/ccea54209d/members/' . md5($member->email_address));
        curl_setopt($chupd, CURLOPT_HTTPHEADER, array(
            'Content-Type: application/json',
            'Authorization: user ' . $mc_apikey));
        curl_setopt($chupd, CURLOPT_USERAGENT, 'PHP-MCAPI/3.0');
        curl_setopt($chupd, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($chupd, CURLOPT_TIMEOUT, 10);
        curl_setopt($chupd, CURLOPT_CUSTOMREQUEST, "PATCH");
        curl_setopt($chupd, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($chupd, CURLOPT_POSTFIELDS, json_encode($data));
        curl_exec($chupd);

        echo "$mcount Updating $member->email_address to ACTION bday" . $diff . "-" . $age . "\n";
        $mcount++;
    }

    if (!is_object($result) || count($result->members) < 1 || $offset + $count > $result->total_items) {
        break;
    }

    $offset += $count;
}