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<?php define('FOO', 'bar'); print_r(array( 'foo' => 'baz' === FOO )); $var = 'baz'; print_r(array( 'foo' => $var == FOO )); $var = 0; print_r(array( 'foo' => $var == FOO )); $var = 'baz'; print_r(array( 'foo' => $var === FOO ));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [foo] => ) Array ( [foo] => ) Array ( [foo] => 1 ) Array ( [foo] => )