a challenge like this $_GET[‘2020’] snippet boring me a long time, i want to know how this work, but do not know which keywords to search, maybe how the parameter works?
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Answer
$_GET reads querystring parameters from the URL. So if someone goes to your PHP script with a URL like http://servername/scriptname.php?2020=ABC then when the PHP script runs, the variable $_GET['2020'] will contain the value ABC.
More info is available in the documentation: https://www.php.net/manual/en/reserved.variables.get.php