Merge pull request #4 from rdlowrey/rdlowrey-ctype-fix

Remove ext/ctype dependency

Author: DaveRandom

src/LibDNS/Records/Types/IPv4Address.php

@@ -86,7 +86,7 @@ public function setOctets(array $octets)
         }
 
         foreach ($octets as &$octet) {
-            if (!ctype_digit((string) $octet) || $octet < 0x00 || $octet > 0xff) {
+            if (strspn((string)$octet, "0123456789") !== strlen($octet) || $octet < 0x00 || $octet > 0xff) {
                 throw new \UnexpectedValueException('Octet list is not a valid IPv4 address: invalid octet value ' . $octet);
             }
 

src/LibDNS/Records/Types/IPv6Address.php

@@ -151,7 +151,7 @@ public function setShorts(array $shorts)
         }
 
         foreach ($shorts as &$short) {
-            if (!ctype_digit((string) $short) || $short < 0x0000 || $short > 0xffff) {
+            if (strspn((string)$short, "0123456789") !== strlen($short) || $short < 0x0000 || $short > 0xffff) {
                 throw new \UnexpectedValueException('Short list is not a valid IPv6 address: invalid short value ' . $short);
             }