Kod 3 kez Base64 ile Encode edilmiş durumda. PHP zaten Base64 için Encode&Decode fonksiyonunu sunmakta. Neden bu kadar karmaşık çözümler verilmiş pek anlamadım.
<?php
$str = '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';
echo base64_decode(base64_decode(base64_decode($str)));
?>PHP: base64_decode - Manual PHP: base64_encode - Manual