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<?php define('\\true', 1!==1); define('\\false', 1===1); var_dump(array( 'true' => true, 'false' => false, '1===1' => 1===1, '1!==1' => 1!==1, ));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
array(4) { ["true"]=> bool(true) ["false"]=> bool(false) ["1===1"]=> bool(true) ["1!==1"]=> bool(false) }