Use call_user_func_array() as call_user_func() cannot pass by reference. see #18785.
git-svn-id: https://develop.svn.wordpress.org/trunk@19155 602fd350-edb4-49c9-b593-d223f7449a82
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@ -737,7 +737,7 @@ final class WP_Screen {
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// If it exists, fire tab callback.
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if ( ! empty( $tab['callback'] ) )
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call_user_func( $tab['callback'], $this, $tab );
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call_user_func_array( $tab['callback'], array( $this, $tab ) );
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?>
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</div>
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<?php endforeach; ?>
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