In WordPress, you can get the ID of the first image in an image gallery from a block on another page using the following code:

phpCopy code$first_image_id = 0;
$post = get_post( $post_id );
$pattern = get_shortcode_regex();
if ( preg_match_all( '/'. $pattern .'/s', $post->post_content, $matches )
&& array_key_exists( 2, $matches )
&& in_array( 'gallery', $matches[2] ) )
{
    $keys = array_keys( $matches[2], 'gallery' );
    foreach ( $keys as $key ) {
        $attrs = shortcode_parse_atts( $matches[3][$key] );
        if ( array_key_exists( 'ids', $attrs ) ) {
            $image_ids = explode( ',', $attrs['ids'] );
            $first_image_id = $image_ids[0];
            break;
        }
    }
}

This code retrieves the post content for the specified $post_id, then uses a regular expression to search for any shortcodes. If any are found, it loops through the shortcodes and retrieves the ids attribute, which is a comma-separated list of image IDs. The first image ID is stored in the $first_image_id variable.

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