[wp-trac] [WordPress Trac] #31287: Use require_once for loading class WP_Admin_Bar

[WordPress Trac]

#31287: Use require_once for loading class WP_Admin_Bar
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 Reporter:  danielbachhuber  |      Owner:
     Type:  defect (bug)     |     Status:  new
 Priority:  normal           |  Milestone:  4.2
Component:  Toolbar          |    Version:
 Severity:  normal           |   Keywords:
  Focuses:                   |
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 Prevent fatals if `_wp_admin_bar_init()` is called twice

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Ticket URL: <https://core.trac.wordpress.org/ticket/31287>
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