- json_decode: documentation ( source)
<?php
echo json_decode('{"event": {"List-Id": ["7dda31658cf1618cf83802c269c69cb6"], "From": ["Maxim.Karanaev@alpari.org"], "Cc": [], "ServerName": ["relay-lt.alpari.dmz.dom"], "To": ["maxim.karanaev@mail.trunk.alpari-ru.dom"], "Subject": ["ТЕСТ4"]}');