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run code in 150+ php & hhvm versions
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<?php $tab =array('actif' => array(array('case' => "clients_active", 'delta' => -845))); $tab['actif'][0]['css'] = 'azerty'; var_dump($tab);
based on OHR6g
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(1) { ["actif"]=> array(1) { [0]=> array(3) { ["case"]=> string(14) "clients_active" ["delta"]=> int(-845) ["css"]=> string(6) "azerty" } } }
Output for hhvm-3.10.0

Process exited with code 153.