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<?php // (1) namespace X; // (2) function f(array $o) { return [&$o['v']]; } $v = ['z', 'a']; $a = ['v' => $v]; $args = f($a); call_user_func_array('sort', $args); // Additionally, if the above 2 lines are replaced by the following // line, the bug never appears. //call_user_func_array('sort', f($a));
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