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<?php $main_url_host = 'main.example.com'; $current_url_host = 'subdomain.main.example.com'; preg_match('~(.+)*\.' . $main_url_host. '$~', $current_url_host, $matches ); var_dump( $matches );
Output for 7.0.0 - 7.0.31, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 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
array(2) { [0]=> string(26) "subdomain.main.example.com" [1]=> string(9) "subdomain" }
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 array(2) { [0]=> string(26) "subdomain.main.example.com" [1]=> string(9) "subdomain" }

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161.63 ms | 402 KiB | 234 Q