If you’re wanting to allow users of your phpBB forum to embed their Vines, here you go:
BBcode usage:
[vine]{SIMPLETEXT1}://vine.co/v/{IDENTIFIER}[/vine]
HTML replacement:
<iframe class="vine-embed" src="https://vine.co/v/{IDENTIFIER}/embed/simple" width="480" height="480" frameborder="0"></iframe><script async src="//platform.vine.co/static/scripts/embed.js" charset="utf-8"></script>
Tip: You can change the height and width to any value – Vine typically use 600, 480 or 320.
Here’s the result: