call for help
I"m really in a hurry right now. I"m going to make a copy of RSS, for An and B (one of which is a facebook instant article).

but I don"t know anything about RSS!

what I thought of
create two number tables, and when you add an article, you will need each of these two number tables. For example, < title > , < description > .

this reminds me of a question: content . When I post an article, I have at least three posts: title , content , cover (the cover photo of the article)
and the tool built by content is the third-party suite editor on the page, but this editor can add clips, or iframe instagram , youtube audio or video, which means I have to be in content .

1. 
2. < iframe > < / iframe >

for example, if he is filming, he wants this format

<image><url> XXX </url></image>

then I must first take out the , then get the content of the src abc.jpg , and then replace it with < image > < url > https://..abc.jpg to return.

No matter what the string is, I must first bring it up and package it as the < tag > tag required by RSS. What function can I use to do this?

and

In

RSS, you have to replace < with & into characters like & .
this really hurts. Help me, God!