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https://stackoverflow.com/questions/1082302/file-get-contents-from-url-that-is-only-accessible-after-log-in-to-website
https://www.hashbangcode.com/article/using-authentication-and-filegetcontents
http://php.net/manual/de/function.file-get-contents.php
https://www.electrictoolbox.com/php-file-get-contents-sending-username-password/
https://board.phpbuilder.com/d/10338126-resolved-using-file-get-contents-on-a-login-site
https://www.tutorialspoint.com/php/php_function_file_get_contents.htm
https://www.youtube.com/watch?v=y4NGBF1vOzc
https://www.joeldare.com/wiki/php:post_with_file_get_contents_from_php
https://www.w3schools.com/php/func_filesystem_file_get_contents.asp
https://www.experts-exchange.com/questions/26190066/Problem-with-PHP's-file-get-contents.html
https://www.geeksforgeeks.org/php-file_get_contents-function/
https://forum.codeigniter.com/thread-68806.html
https://joshtronic.com/2013/06/04/specifying-a-user-agent-when-using-file_get_contents/