<?php
$html = '<span id="Number">12345678993</span>
<span id="holderName">RAFAELA VERCOSA MARIANO</span>
<span id="expirationDate">11/2019</span>';
$DOM = new DOMDocument;
$DOM->loadHTML($html);
$items = $DOM->getElementsByTagName('span');
// Imprimindo os valores
for ($i = 0; $i < $items->length; $i++)
echo $items->item($i)->nodeValue . PHP_EOL;
PD9waHAKCiRodG1sID0gJzxzcGFuIGlkPSJOdW1iZXIiPjEyMzQ1Njc4OTkzPC9zcGFuPgoKPHNwYW4gaWQ9ImhvbGRlck5hbWUiPlJBRkFFTEEgVkVSQ09TQSBNQVJJQU5PPC9zcGFuPgoKPHNwYW4gaWQ9ImV4cGlyYXRpb25EYXRlIj4xMS8yMDE5PC9zcGFuPic7CgokRE9NID0gbmV3IERPTURvY3VtZW50OwokRE9NLT5sb2FkSFRNTCgkaHRtbCk7CiRpdGVtcyA9ICRET00tPmdldEVsZW1lbnRzQnlUYWdOYW1lKCdzcGFuJyk7CiAgICAKLy8gSW1wcmltaW5kbyBvcyB2YWxvcmVzCmZvciAoJGkgPSAwOyAkaSA8ICRpdGVtcy0+bGVuZ3RoOyAkaSsrKQogICAgZWNobyAkaXRlbXMtPml0ZW0oJGkpLT5ub2RlVmFsdWUgLiBQSFBfRU9MOwo=