Make a query variable public

In case you are messing with custom rewrite rules in WordPress and especially creating new ones with the generate_rewrite_rules hook, you should know how to make a private (or a custom, which is by default – non-public) query variable public in order to have it working correctly in the rewrite rule.

It’s actually pretty simple – you just need to add a new element in the array, that is filtered by the query_vars filter. Like so:

That’s all.

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