WordPress Importer Hooks for decoding base64 and unserialize content

gistfile1.txt

<?php

/**
 * WordPress Importer Hooks for decoding base64 and unserialize content
 
 * @see     https://medium.com/@bantunes/wordpress-comment-jai-importé-500-articles-encodés-en-base64-d-un-builder-à-gutenberg-29c3d9d9e694
 * @author  Bruno ANTUNES
 * @version 1.0.0
 */

class MfnImporter {
    
    public function __construct() {
        add_action( 'import_post_meta', array( $this, 'store_decoded_meta' ), 10, 3 );
        add_action( 'import_end', array( $this, 'process_imported_posts' ) );
    }

    public function store_decoded_meta( $post_id, $key, $value ) {
        if ( 'mfn-page-items' == $key ) {
            $decoded_value = base64_decode( $value );
            $unserialized_value = unserialize( $decoded_value );

            if ( $unserialized_value !== false ) {
                update_post_meta($post_id, '_tmp_mfn_content', $this->extract_column_content($unserialized_value));
            }
        }
    }

    public function extract_column_content($data) {
        $content = '';
    
        // Boucler à travers chaque "élément"
        foreach ($data as $main_item) {
            if (isset($main_item['wraps']) && is_array($main_item['wraps'])) {
    
                // Boucler à travers chaque "wrap"
                foreach ($main_item['wraps'] as $wrap) {
                    if (isset($wrap['items']) && is_array($wrap['items'])) {
    
                        // Boucler à travers chaque "item"
                        foreach ($wrap['items'] as $item) {
                            if (isset($item['type']) && $item['type'] === 'column' && isset($item['fields']['content'])) {
    
                                // Convertir le contenu en bloc Gutenberg de type paragraphe
                                $content .= '<!-- wp:paragraph -->';
                                $content .= $item['fields']['content'];
                                $content .= '<!-- /wp:paragraph -->';
                            }
                        }
                    }
                }
            }
        }
        
        return $content;
    }

    public function process_imported_posts() {
        $args = array(
            'post_type' => 'post', // type de post que vous importez
            'meta_key' => '_tmp_mfn_content',
            'posts_per_page' => -1
        );
        $posts = get_posts($args);
        
        foreach ($posts as $post) {
            $mfn_content = get_post_meta($post->ID, '_tmp_mfn_content', true);
            if ($mfn_content) {
                $updated_content = $post->post_content . "\n\n" . $mfn_content;
                wp_update_post(array('ID' => $post->ID, 'post_content' => $updated_content));
                delete_post_meta($post->ID, '_tmp_mfn_content');
            }
        }
    }
}

new MfnImporter();