3v4l.org

run code in 300+ PHP versions simultaneously
<?php $arr = [0,1,2,[3,4,[5,6]]]; $recit = new RecursiveArrayIterator($arr); $it = new RecursiveTreeIterator($recit); foreach($it as $key=>$val) { echo $key . '=>' . $val, PHP_EOL; }
Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.12 - 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
0=>|-0 1=>|-1 2=>|-2 3=>\-Array 0=> |-3 1=> |-4 2=> \-Array 0=> |-5 1=> \-6
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/tCbtA on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/tCbtA on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/tCbtA on line 2
Process exited with code 255.

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