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<?php $domains = [ 'a-.bc.com', 'a.bc-.com', 'a.bc.com-', ]; foreach ($domains as $domain) { echo $domain . PHP_EOL; var_dump(filter_var($domain, FILTER_VALIDATE_DOMAIN, FILTER_FLAG_HOSTNAME)); echo PHP_EOL; }
Output for 8.2.26 - 8.2.29, 8.3.14 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0 - 8.5.1
a-.bc.com bool(false) a.bc-.com bool(false) a.bc.com- bool(false)
Output for 8.4.15
/bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.
Output for 8.1.0 - 8.1.33, 8.2.0 - 8.2.25, 8.3.0 - 8.3.13
a-.bc.com bool(false) a.bc-.com bool(false) a.bc.com- string(9) "a.bc.com-"
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62.32 ms | 409 KiB | 5 Q