我们可以尝试使用has_block(), has_blocks() 和parse_blocks() 查找具有给定providerNameSlug 属性

未经测试的建议：

function has_block_embed_by_provider_wpse( $provider, $post = null ) {
    if ( ! has_blocks( $post ) ) {
        return false;
    }
 
    if ( ! is_string( $post ) ) {
        $wp_post = get_post( $post );
        if ( $wp_post instanceof WP_Post ) {
            $post = $wp_post->post_content;
        }
    }
   
    if ( has_block ( \'embed\', $post ) ) {
        $blocks = parse_blocks ( $post );
        foreach( (array) $blocks as $block ) {
            if ( isset( $block[\'attrs\'][\'providerNameSlug\'] ) 
                 && $provider === $block[\'attrs\'][\'providerNameSlug\'] 
            ) {
                return true;
            }
        }
    }
    return false;
}

Usage Examples:

has_block_embed_by_provider_wpse( \'vimeo\' )

has_block_embed_by_provider_wpse( \'vimeo\', $content )

has_block_embed_by_provider_wpse( \'vimeo\', $post )

has_block_embed_by_provider_wpse( \'vimeo\', 123 )

has_block_embed_by_provider_wpse( \'vimeo\', get_post( 123 ) )