* Registers a local field group in Advanced Custom Fields based on a config array.
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*
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* Included fields, subfields, etc. can either contain another array defining them, or a string that stands for a WordPress filter. This filter will be applied and its result used as the field, subfield, etc.
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*
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* @param array $config Configuration array for the local field group.
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*
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* @return boolean Was the field group added or not.
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*/
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public static function registerFieldGroup($config)