php: convert all relative urls in absolute urls

maybe this is an old question but i'm trying as a personal experiment to fetch a page form the web and the make a copy out of it with all the relative urls, links, href, src etc withn absolute urls

i'm using CURL to fetch hte page and I have now a $html variable that contains all the code..

so what; the next step? shoud i use preg_replace? how?

thanks

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下一步是将它放入一个HTML解析器中，并遍历树，查找和修复标签上a href属性， img标签上a src属性等等。解析器将能够将该树重新发射为一个字符串一旦你完成了。

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