Where can I place the code and then paste it on my site?

Question

Code editor

Hello. I need to embed a code on a website ( (embed iframe) ) with syntax highlighting. Now I'm using github (secret gist) for this, but it doesn't suit me externally. You can use jsfiddle, but you can't put PHP code there. What other sites are there for placing code there, with the ability to get an iframe from there?