3v4l.org

run code in 300+ PHP versions simultaneously
<?php $result = array( array(1 => "a", 1 => "b"), array(2 => "c", 2 => "d"), ); print_r($result);
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
Array ( [0] => Array ( [1] => b ) [1] => Array ( [2] => d ) )

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111.28 ms | 407 KiB | 5 Q