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<?php $ip = '1asadsadads'; var_dump(filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4 | FILTER_FLAG_IPV6)); var_dump(!filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE));
Output for git.master, git.master_jit, rfc.property-hooks
bool(false) bool(true)

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