facebook-instant-articles-sdk-php
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Treat charset/encoding and parameter \DOMDocument for toDOMElement()
We need to treat correctly the charset encoding and also force parameter \DOMDocument to be created already or we create it considering the charset encoding informed
Also make parameter required.
Reference: https://github.com/facebook/facebook-instant-articles-sdk-php/pull/280#discussion_r151795416
Reference: https://github.com/facebook/facebook-instant-articles-sdk-php/pull/280#discussion_r151794097