BIND resource records allow an explict TTL value that will override the zone file’s TTL for that specific resource record. One use for this is to prevent non-authoritative servers from caching these records, perhaps in prelude to changing a server’s IP address.
The PTR (pointer) record maps an IP address to a hostname and fully qualified domain name. Many applications use reverse lookups to identify the domain from which a TCP/IP connection is formed. Best practice for DNS is to create a PTR record for every A record.
Adding static host name to IP address mappings in a router (like a UNIX /etc/hosts file) can make life easier. These can override DNS entries for the host when needed, and can make easy references to other systems or devices that are not appropriate for DNS entries.
Word 2003 now includes the ability to easily translate text to different languages.
To sort an associative array by the array values, use asort.
To sort an associative array by index values (or keys), use ksort.
An associative array can use non-numeric index values and are useful because they can be iterated over sequentially and values can be extracted individually by index. Database select results can be returned as associative arrays in which the column names become indicies.
You may want all visitors to your site using www in front of your domain name (www.yourdomain.com) instead of just your domain name (yourdomain.com). By implementing a simple .htaccess RewriteRule, visitors to yourdomain.com will see the URL change in their browser as they are redirected to the correct URL.
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