[wp-trac] [WordPress Trac] #34202: esc_url() cannot handle IPv6 literal URLs in PHP < 5.4.7

[WordPress Trac]

#34202: esc_url() cannot handle IPv6 literal URLs in PHP < 5.4.7
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 Reporter:  johnbillion   |      Owner:
     Type:  defect (bug)  |     Status:  new
 Priority:  low           |  Milestone:  Awaiting Review
Component:  Formatting    |    Version:  3.1
 Severity:  normal        |   Keywords:  needs-patch
  Focuses:                |
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 In PHP < 5.4.7, `parse_url()` cannot handle IPv6 literal URLs such as
 `http://[::FFFF::127.0.0.1]/`. This means `esc_url()` cannot correctly
 handle such URLs because it relies on `parse_url()` to separate the
 domain/port from the path/query in order to determine whether to encode
 square brackets or not.

 Prior to [34920], `esc_url()` blindly stripped all square brackets and
 didn't use `parse_url()`.

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Ticket URL: <https://core.trac.wordpress.org/ticket/34202>
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