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<?php function getIPStringForFullDNS($ip, $class) { $limits = array('A' => -3, 'B' => -2, 'C' => -1, 'D' => 0); $limit = $limits[$class]; $ip = implode('.', explode('.', $ip, $limit)); $ip .= str_repeat('.*', abs($limit)); return $ip; } echo getIPStringForFullDNS('158.58.169.254', 'A') . "\n"; echo getIPStringForFullDNS('158.58.169.254', 'B') . "\n"; echo getIPStringForFullDNS('158.58.169.254', 'C') . "\n"; echo getIPStringForFullDNS('158.58.169.254', 'D') . "\n";
Output for git.master, git.master_jit, rfc.property-hooks
158.*.*.* 158.58.*.* 158.58.169.* 158.58.169.254

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