- base64_decode: documentation ( source)
<?php
if (base64_decode('OTY5MmQ1OTQtYWNmYy00MmRhLTljMDEtN2MxNDBmMDRiZWViLGU0YzRhNGZiLTY3M2QtNDkzYS05ZWYxLTY2MWZhMzgyM2FkNw==') === base64_decode('OTY5MmQ1OTQtYWNmYy00MmRhLTljMDEtN2MxNDBmMDRiZWViLGU0YzRhNGZiLTY3M2QtNDkzYS05ZWYxLTY2MWZhMzgyM2FkNw')) {
echo 'true';
} else {
echo 'false';
}