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PUM_Utils_Fields::flatten_fields_array( $tabs )

	public static function flatten_fields_array( $tabs ) {
		$fields = array();

		foreach ( $tabs as $tab_id => $tab_sections ) {

			if ( self::is_field( $tab_sections ) ) {
				$fields[ $tab_id ] = $tab_sections;
				continue;
			} else {
				foreach ( $tab_sections as $section_id => $section_fields ) {

					if ( self::is_field( $tab_sections ) ) {
						$fields[ $section_id ] = $section_fields;
						continue;
					}

					foreach ( $section_fields as $field_id => $field ) {
						$fields[ $field_id ] = $field;
						continue;
					}
				}
			}
		}

		return $fields;
	}