Paging through a collection

pageiterator.php

<?php
use Microsoft\Graph\Core\Tasks\PageIterator;
use Microsoft\Graph\Generated\Models\Message;
use DateTimeInterface;

$messages = $graphServiceClient->users()->byUserId(USER_ID)->messages()->get()->wait();

$pageIterator = new PageIterator($messages, $graphServiceClient->getRequestAdapter());

$counter = 0;
$callback = function (Message $message) use (&$counter) {
    echo "Subject: {$message->getSubject()}, Received at: {$message->getReceivedDateTime()->format(DateTimeInterface::RFC2822)}\n";
    $counter ++;
    return ($counter % 5 != 0);
};

while ($pageIterator->hasNext()) {
    // iteration pauses and resumes after every 5 messages
    $pageIterator->iterate($callback);

    echo "\nPaused iteration...Total messages: {$counter}\n\n";
}