[wp-trac] [WordPress Trac] #35274: Break-out conditional in allow_subdomain_install()

[WordPress Trac]

#35274: Break-out conditional in allow_subdomain_install()
--------------------------------+-----------------------------
 Reporter:  stevegrunwell       |      Owner:
     Type:  enhancement         |     Status:  new
 Priority:  normal              |  Milestone:  Awaiting Review
Component:  Networks and Sites  |    Version:  trunk
 Severity:  normal              |   Keywords:
  Focuses:  multisite           |
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 Attached patch expands the conditional within
 `allow_subdomain_install()`with better inline documentation, replaces the
 IP address regex with `filter_var( $var, FILTER_VALIDATE_IP )`
 ([[http://us3.php.net/manual/en/function.filter-var.php supported in PHP
 5.2.0+]), and adds unit tests.

 This came about while working on a refresh for #22330, trying to add
 missing unit tests along the way, and includes one of the regex changes
 from @nacin's patch.

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Ticket URL: <https://core.trac.wordpress.org/ticket/35274>
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