I got custom function where I retrieve guid's attached to each post. Now I want to add this on WordPress API.

global $wpdb;

$post_id= $object['id'];
$sql = "SELECT post_content FROM wp_posts WHERE id = $post_id";

$results = $wpdb->get_results($sql);

foreach ($results as $result) {
    $content = $result->post_content;

    $needle = 'gallery_ids="';

    $offset = strpos($content,$needle);

        $offset += strlen($needle);

        $l = strpos($content,'"',$offset);
        $l -= $offset;
        $content = substr($content,$offset,$l);
        $content = explode(",",$content);
        function filterGuid($var) {return is_numeric($var);}
        $content = array_filter($content,"filterGuid");

        for ($x = 0; $x <= count($content) -1; $x++) {
            $guids = "SELECT guid FROM wp_posts WHERE id IN ('$content[$x]')";
            $gui_results = $wpdb->get_results($guids);

            foreach ($gui_results as $result) {
                echo $result->guid;

What changes to make to add it?

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