php - Facebook loading images from another sites with given link -

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i want know how facebook can extract images given link. if please me. here screen of mean. facebook screen

you should read on document object model:

https://en.wikipedia.org/wiki/document_object_model

this extremely general question, , there many, many ways it. jquery's find() it, example, if search img tag. pretty every language has library navigating dom. looking @ tagged languages in question, you've got php's domdocument , python's xml.dom. if you're super new stuff, should graph theory , tree data structures, because that's core idea of dom.


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