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run code in 150+ php & hhvm versions
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<?php $a = array('xml' => array( 'attributes' => array( 'version' => '1.0', 'encoding' => 'utf-8', ), )); $a['xml']['attributes'] = array_merge($a['xml']['attributes'], array('test' => 'my_test_123')); print_r($a);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [xml] => Array ( [attributes] => Array ( [version] => 1.0 [encoding] => utf-8 [test] => my_test_123 ) ) )