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<?php $foo = null; $attributes = array('class' => 'control-label'); if ($foo) { echo '1'; $attributes = array_merge($foo, $attributes); } var_dump($attributes);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(1) { ["class"]=> string(13) "control-label" }