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run code in 300+ PHP versions simultaneously
<?php $arr = array( null => 'a', true => 'b', false => 'c', 0 => 'd', 1 => 'e', '' => 'f' ); var_dump($arr); ?>
Output for 4.3.2 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
array(3) { [""]=> string(1) "f" [1]=> string(1) "e" [0]=> string(1) "d" }
Output for 4.3.0 - 4.3.1
array(3) { [""]=> string(1) "f" [0]=> string(1) "d" [1]=> string(1) "e" }

preferences:
232.48 ms | 401 KiB | 356 Q