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run code in 300+ PHP versions simultaneously
<?php $x = []; for($i=4;$i>=0;$i--){ $x = [$i => $x]; } print_r($x);
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => Array ( [1] => Array ( [2] => Array ( [3] => Array ( [4] => Array ( ) ) ) ) ) )

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