vue-wp/plugins/cia-endpoints/includes/reformat-blocks.php

<?php
    function get_ids_from_gallery_block($blocks){
        $parsed_blocks = array();
        foreach ($blocks as $block) {
            if($block[blockName] === "core/gallery") {
                array_push($parsed_blocks, $block[attrs]);
            } elseif ($block[blockName] === "core/image") {
                $ids = [];
                $galleryFormat = [];
                array_push($ids, $block[attrs][id]);
                $galleryFormat[ids] = $ids;
                $galleryFormat[columns] = 1;
                $galleryFormat[linkTo] = 'none';
                array_push($parsed_blocks, $galleryFormat);
            }
        }
        return $parsed_blocks;
    }
    function get_images_from_content($content) {
        $parse_images = array();

        $dom = new DOMDocument();
        @ $dom->loadHTML($content);
        $images = $dom->getElementsByTagName('img');

        foreach ($images as $image) {
            if($image->getAttribute('data-id')) {
                $parse_images[$image->getAttribute('data-id')] = $image->getAttribute('src');
            } else {
                $class_pieces = explode("-", $image->getAttribute('class'));
                $parse_images[end($class_pieces)] = $image->getAttribute('src');
            }
        }
        return $parse_images;
    }
?>