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並前往https://wordpress.com/forums/topic/fatal-error-call-to-undefined-function-is_active_sidebar/

Fatal error: Call to undefined function is_active_sidebar()

So let's check that first. * * If none of the sidebars have widgets, then let's bail early. */ if ( ! is_active_sidebar( 'first-footer- ...

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查詢 「Is_active_sidebar」的人也找了：

  1. dynamic_sidebar
    2.
  2. wp_get_sidebars_widgets
    3.
  3. is_attachment
    4.
  4. register_sidebar
    5.
  5. is_active_widget
    6.
  6. wp_query
    7.
  7. call widget in wordpress
    8.
  8. register widget in wordpress
    9.