Edit file File name : import-helper.php Content :<?php namespace Yoast\WP\SEO\Helpers; /** * The Import Helper. */ class Import_Helper { /** * Flattens a multidimensional array of settings. Recursive. * * @param array $array_to_flatten The array to be flattened. * @param string $key_prefix The key to be used as a prefix. * * @return array The flattened array. */ public function flatten_settings( $array_to_flatten, $key_prefix = '' ) { $result = []; foreach ( $array_to_flatten as $key => $value ) { if ( \is_array( $value ) ) { $result = \array_merge( $result, $this->flatten_settings( $value, $key_prefix . '/' . $key ) ); } else { $result[ $key_prefix . '/' . $key ] = $value; } } return $result; } } Save