[wp-trac] [WordPress Trac] #21142: Add a filter to domain_exists() function

[WordPress Trac]

#21142: Add a filter to domain_exists() function
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 Reporter:  jamescollins  |      Owner:
     Type:  enhancement   |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Multisite     |    Version:
 Severity:  normal        |   Keywords:  has-patch
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 In Multisite, the domain_exists() function is used by WordPress to "check
 whether the specified blogname is already taken", however it doesn't
 provide any filter so that plugins can override the result.

 '''Our Use Case:'''

 On our multisite installs, we allow users to change their subdomain name
 (or domain name).

 We keep a list of their previously used subdomains/domains, and if there
 is a HTTP request for one of their old domains, we automatically perform a
 301 redirect to the new domain name.

 However, we also want to make sure that other users cannot use any
 subdomain/domain name that has been used by another user.

 Currently we have no way to override the return value of the
 domain_exists() function, which means we can't easily prevent other people
 from signing up for sites that use a domain/subdomain name

 '''Suggestion:'''

 Add a simple filter to the end of the domain_exists() function. See
 attached patch.

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Ticket URL: <http://core.trac.wordpress.org/ticket/21142>
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