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Editing: export-keywords-term-presenter.php

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<?php
/**
 * WPSEO Premium plugin file.
 *
 * @package WPSEO\Premium\Classes\Export
 */

/**
 * Class WPSEO_Export_Keywords_Term_Presenter
 *
 * Readies data as returned by WPSEO_Export_Keywords_Term_Query for exporting.
 */
class WPSEO_Export_Keywords_Term_Presenter implements WPSEO_Export_Keywords_Presenter {

/**
	 * The columns to query for.
	 *
	 * @var array
	 */
	protected $columns;

/**
	 * WPSEO_Export_Keywords_Term_Presenter constructor.
	 *
	 * Supported values for columns are 'title', 'url', 'keywords', 'readability_score' and 'keywords_score'.
	 * Requesting 'keywords_score' will always also return 'keywords'.
	 *
	 * @param array $columns The columns we want our query to return.
	 */
	public function __construct( array $columns ) {
		$this->columns = array_filter( $columns, 'is_string' );
	}

/**
	 * Creates a presentable result by modifying and adding the requested fields.
	 *
	 * @param array $result The result to modify.
	 *
	 * @return array The modified result or an empty array if the result is considered invalid.
	 */
	public function present( array $result ) {
		if ( ! $this->validate_result( $result ) ) {
			return [];
		}

$result['ID'] = (int) $result['term_id'];
		unset( $result['term_id'] );

foreach ( $this->columns as $column ) {
			$result = $this->prepare_column_result( $result, $column );
		}

$result['type'] = $result['taxonomy'];
		unset( $result['taxonomy'] );

return $result;
	}

/**
	 * Prepares the passed result to make it more presentable.
	 *
	 * @param array  $result The result to modify.
	 * @param string $column The requested column.
	 *
	 * @return array The prepared result.
	 */
	protected function prepare_column_result( array $result, $column ) {
		switch ( $column ) {
			case 'keywords':
				$result['keywords'] = $this->get_result_keywords( $result );
				break;
			case 'keywords_score':
				$result['keywords_score'] = $this->get_result_keywords_score( $result );
				break;
			case 'url':
				$result['url'] = get_term_link( $result['ID'], $result['taxonomy'] );
				break;
			case 'title':
				$result['title'] = $result['name'];
				unset( $result['name'] );
				break;
			case 'seo_title':
				$result['seo_title'] = WPSEO_Taxonomy_Meta::get_term_meta( $result['ID'], $result['taxonomy'], 'title' );
				break;
			case 'meta_description':
				$result['meta_description'] = WPSEO_Taxonomy_Meta::get_term_meta( $result['ID'], $result['taxonomy'], 'desc' );
				break;
			case 'readability_score':
				$content_score               = WPSEO_Taxonomy_Meta::get_term_meta( $result['ID'], $result['taxonomy'], 'content_score' );
				$result['readability_score'] = WPSEO_Rank::from_numeric_score( (int) $content_score )->get_label();
				break;
		}

return $result;
	}

/**
	 * Returns whether a result to present is a valid result.
	 *
	 * @param array $result The result to validate.
	 *
	 * @return bool True if the result is validated.
	 */
	protected function validate_result( array $result ) {
		// If there is no ID then it's not valid.
		if ( ! array_key_exists( 'term_id', $result ) ) {
			return false;
		}

// If a title is requested but not present then it's not valid.
		if ( $this->column_is_present( 'title' ) && $this->has_title( $result ) === false ) {
			return false;
		}

return true;
	}

/**
	 * Determines if the result contains a valid title.
	 *
	 * @param array $result The result array to check for a title.
	 *
	 * @return bool Whether or not a title is valid.
	 */
	protected function has_title( $result ) {
		if ( ! is_array( $result ) || ! array_key_exists( 'name', $result ) ) {
			return false;
		}

return is_string( $result['name'] );
	}

/**
	 * Determines if the wanted column exists within the $this->columns class variable.
	 *
	 * @param string $column The column to search for.
	 *
	 * @return bool Whether or not the column exists.
	 */
	protected function column_is_present( $column ) {
		if ( ! is_string( $column ) ) {
			return false;
		}

return in_array( $column, $this->columns, true );
	}

/**
	 * Gets the result keywords from WPSEO_Taxonomy_Meta.
	 *
	 * @param array $result The result to get the keywords for.
	 *
	 * @return array The keywords.
	 */
	protected function get_result_keywords( array $result ) {
		$keyword = WPSEO_Taxonomy_Meta::get_term_meta( $result['ID'], $result['taxonomy'], 'focuskw' );

if ( $keyword === false || empty( $keyword ) ) {
			return [];
		}

return [ (string) $keyword ];
	}

/**
	 * Gets the result keyword scores from WPSEO_Taxonomy_Meta.
	 *
	 * @param array $result The result to get the keyword scores for.
	 *
	 * @return array The keyword scores.
	 */
	protected function get_result_keywords_score( array $result ) {
		$keyword_score = WPSEO_Taxonomy_Meta::get_term_meta( $result['ID'], $result['taxonomy'], 'linkdex' );

if ( $keyword_score === false || empty( $keyword_score ) ) {
			return [];
		}

$keyword_score_label = WPSEO_Rank::from_numeric_score( (int) $keyword_score )->get_label();

return [ $keyword_score_label ];
	}
}

Editing: export-keywords-term-presenter.php

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