3v4l.org

run code in 300+ PHP versions simultaneously
<?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') . '<br>'; echo getIPStringForFullDNS('158.58.169.254', 'B') . '<br>'; echo getIPStringForFullDNS('158.58.169.254', 'C') . '<br>'; echo getIPStringForFullDNS('158.58.169.254', 'D') . '<br>';
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 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 - 8.3.6
158.*.*.*<br>158.58.*.*<br>158.58.169.*<br>158.58.169.254<br>
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5
158.58.169.254.*.*.*<br>158.58.169.254.*.*<br>158.58.169.254.*<br>158.58.169.254<br>
preferences:
241.77 ms | 402 KiB | 357 Q