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<?php $b['ss'] = 'sds'; $a['ss'] = $b; foreach($a as $key => $value){ $new_array[$key] = $value[1]; } var_dump($new_array);
Output for 5.3.0 - 5.6.28, 7.0.0 - 7.1.0
Notice: Undefined offset: 1 in /in/9jfYb on line 6 array(1) { ["ss"]=> NULL }
Output for hhvm-3.12.0
Notice: Undefined index: 1 in /in/9jfYb on line 6 array(1) { ["ss"]=> NULL }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.0 - 5.2.17
Notice: Undefined offset: 1 in /in/9jfYb on line 6 array(1) { ["ss"]=> NULL }