Online PHP editor | rfc for dVq82

@ 2014-10-10T07:46:31Z

<?php
function convertIPv6To4($ip) {
	// validate if given IP is a proper IPv6 address
	if (filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6) === false) {
		// validate if given IP is a proper IPv4 address
		if (filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4) === false) {
			// ip address is invalid
			return '';
		}
		
		return $ip;
	}
	
	// check if ip is a masked IPv4 address
	if (substr($ip, 0, 7) == '::ffff:') {
		$ip = substr($ip, 7);
		if (preg_match('~^([a-f0-9]{1,4}):([a-f0-9]{1,4})$~', $ip, $matches)) {
			$ip = array(
				base_convert($matches[1], 16, 10),
				base_convert($matches[2], 16, 10)
			);
			
			$ipParts = array();
			$tmp = $ip[0] % 256;
			$ipParts[] = ($ip[0] - $tmp) / 256;
			$ipParts[] = $tmp;
			$tmp = $ip[1] % 256;
			$ipParts[] = ($ip[1] - $tmp) / 256;
			$ipParts[] = $tmp;
			
			return implode('.', $ipParts);
		}
		else {
			return $ip;
		}
	}
	else {
		// given ip is an IPv6 address and cannot be converted
		return $ip;
	}
}

echo convertIPv6To4('::ffff:bc65:d048');

Output for git.master, git.master_jit, rfc.property-hooks: 188.101.208.72

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