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<?php function get_host($url) { $host = parse_url($url, PHP_URL_HOST); $names = explode(".", $host); if(count($names) == 1) { return $names[0]; } $names = array_reverse($names); return $names[1] . '.' . $names[0]; } echo get_host('https://google.com'); // google.com echo "\n"; echo get_host('https://www.google.com'); // google.com echo "\n"; echo get_host('https://sub1.sub2.google.com'); // google.com echo "\n"; echo get_host('http://localhost'); // localhost
Output for 5.1.2 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
google.com google.com google.com localhost
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 google.com google.com google.com localhost
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.1
Notice: Use of undefined constant PHP_URL_HOST - assumed 'PHP_URL_HOST' in /in/8RsIQ on line 4 Warning: parse_url() expects exactly 1 parameter, 2 given in /in/8RsIQ on line 4 Notice: Use of undefined constant PHP_URL_HOST - assumed 'PHP_URL_HOST' in /in/8RsIQ on line 4 Warning: parse_url() expects exactly 1 parameter, 2 given in /in/8RsIQ on line 4 Notice: Use of undefined constant PHP_URL_HOST - assumed 'PHP_URL_HOST' in /in/8RsIQ on line 4 Warning: parse_url() expects exactly 1 parameter, 2 given in /in/8RsIQ on line 4 Notice: Use of undefined constant PHP_URL_HOST - assumed 'PHP_URL_HOST' in /in/8RsIQ on line 4 Warning: parse_url() expects exactly 1 parameter, 2 given in /in/8RsIQ on line 4
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/8RsIQ on line 20
Process exited with code 255.

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