Use call_user_func_array() as call_user_func() cannot pass by reference. see #18785.
git-svn-id: https://core.svn.wordpress.org/trunk@19155 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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git-svn-id: https://core.svn.wordpress.org/trunk@19155 1a063a9b-81f0-0310-95a4-ce76da25c4cd