wp_example.decomp.php

function wp_attachment_is($type, $post) {
    $post = get_post($post);
    if (!$post) {
        return false;
    }

    $file = get_attached_file($post->ID);
    if (!$file) {
        return false;
    }

    if (str_starts_with($post->post_mime_type, $type . '/')) {
        return true;
    }

    $check = wp_check_filetype($file);
    if (empty($check['ext'])) {
        return false;
    }

    $ext = $check['ext'];
    
    if ($post->post_mime_type !== 'import' && $type === $ext) {
        return true;
    }

    switch ($type) {
        case 'image':
            $image_exts = ['jpg', 'jpeg', 'jpe', 'gif', 'png', 'webp', 'avif'];
            return in_array($ext, $image_exts, true);
        case 'audio':
            $audio_exts = wp_get_audio_extensions();
            return in_array($ext, $audio_exts, true);
        case 'video':
            $video_exts = wp_get_video_extensions();
            return in_array($ext, $video_exts, true);
        default:
            return $type === $ext;
    }
}