How can I use XPath to load a specific element from an external website, into my website?

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I want to load an element from an external website, using XPath, into my website... as my web page loads the page

This link to a similar question below I feel is close to my answer. However, I dont know how to apply this using XPath.

How Can I load a specific DIV from an external webpage, into a specific DIV of my website?

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It is desirable that the answer be:

The inputs should be the external URL, and the XPath. The output should print the element

The answer in PHP is desirable