[wp-trac] [WordPress Trac] #58197: $blog_id always returns 0 in get_site_icon_url hook

[WordPress Trac]

#58197: $blog_id always returns 0 in get_site_icon_url hook
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 Reporter:  revxx14       |       Owner:  (none)
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  6.3
Component:  Customize     |     Version:  4.4
 Severity:  normal        |  Resolution:
 Keywords:  needs-patch   |     Focuses:  multisite
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Comment (by revxx14):

 @petitphp if I use the `get_site_icon_url` without adding any sort of
 check against `$blog_id`, all of the icons under "My Sites" in the admin
 toolbar break. My example is a little simplified, but the goal here is to
 use a different icon for each site in the multisite. The particular site
 that I'm trying to set this up on returns `7` for `get_current_blog_id()`,
 so I don't understand why `$blog_id` returns `0`. Shouldn't that change
 for each site in the multisite?

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Ticket URL: <https://core.trac.wordpress.org/ticket/58197#comment:4>
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