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X-WR-CALNAME:19/07/2007: PHP Domain Class
X-WR-CALDESC:On Usenet an often-asked question is how to programmatically determine the “domain” of a particular hostname. That is, excluding the components traditionally thought of as subdomains. As an example, groups.google.com and www.google.com both have a domain of google.com.  Invariably, one answer comes back stating that you just need to chop off everything from the front, leaving only the last two components. But then someone will chime in pointing out that groups.google.co.uk would be left as just co.uk that way, when what is really wanted is google.co.uk. And the eventual resolution of the argument will be “it just can’t be done”.  The problem is that there’s technically no difference between a domain and a subdomain: it’s simply a matter of convention. Fortunately, this issue is actually quite important to browser programmers, as it’s a key issue in cookie security: browsers must allow subdomains within a domain to share cookie data, but not allow cookies…
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URL:http://tobyinkster.co.ukhttp://tobyinkster.co.uk/blog/2007/07/19/php-domain-class/comments#comment1
SUMMARY:Comment 001
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STATUS:NEEDS-ACTION
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DTSTART:20070901T202516Z
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URL:http://tobyinkster.co.ukhttp://tobyinkster.co.uk/blog/2007/07/19/php-domain-class/comments#comment2
SUMMARY:Comment 002
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STATUS:NEEDS-ACTION
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DTSTART:20070906T132653Z
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URL:http://tobyinkster.co.ukhttp://tobyinkster.co.uk/blog/2007/07/19/php-domain-class/comments#comment3
SUMMARY:Comment 003
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STATUS:NEEDS-ACTION
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DTSTART:20070921T091009Z
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URL:http://tobyinkster.co.ukhttp://tobyinkster.co.uk/blog/2007/07/19/php-domain-class/comments#comment4
SUMMARY:Comment 004
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STATUS:NEEDS-ACTION
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DTSTART:20071127T024732Z
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URL:http://tobyinkster.co.ukhttp://tobyinkster.co.uk/blog/2007/07/19/php-domain-class/comments#comment5
SUMMARY:Comment 005
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STATUS:NEEDS-ACTION
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