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// User IDs from the form.
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get_users( [
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$form_data = [
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	'meta_query' => [
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	14,
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		[
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	2346,
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			'key' => 'subscribing_authors'
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	125,
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			'value' => 123,
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];
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			'compare' => 'IN'
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		],
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// Clear previous data in case user unsubscribed someone.
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	],
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delete_user_meta( $updated_user_id, 'subscribing_authors' );
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] );