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<?php $array = array('key' => 'value'); $true = $array['key'] == 'value'; $true = true; var_dump([$true]);
based on s84CC
Output for 5.6.0 - 5.6.38, hhvm-3.18.4 - 3.22.0, 7.0.0 - 7.2.11
array(1) { [0]=> bool(true) }
Output for hhvm-3.15.4

Process exited with code 137.