How major websites capture thumbnails from a link?

How major websites capture thumbnails from a link?

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preg_match returns Notice: Undefined offset

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PHP function to grab all links inside a <DIV> on remote site using scrape method

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preg_match html code <request></request>

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preg_match fails to find simple regex

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How do I retrieve individual header field values in PHP after retrieving the header string with CURL?

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Loop Preg_match until no more matches

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PHP preg_match not showing results

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preg_match() + regex does not work in TXT file

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Unable to get all the span values

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How to preg_match this text/javascript in html loaded

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Extract a specific part from a html document , php cURL , php, preg_match

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